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A184660 Number of (n+2)X3 0..3 arrays with each 3X3 subblock singular 1
49246, 1352770, 35802874, 742295518, 17984702194, 426536161750, 9789497534962, 230620412950366, 5400694882775818, 125973364404722134, 2950593093864039562, 69018872882507417134, 1613797015382550341674, 37757644419274785266902 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A184663
LINKS
FORMULA
Empirical: a(n)=91*a(n-1)-3628*a(n-2)+87500*a(n-3)-1557233*a(n-4)+24242529*a(n-5)-353104846*a(n-6)+4612523786*a(n-7)-52257555237*a(n-8)+521931046943*a(n-9)-4698531976340*a(n-10)+38093764686792*a(n-11)-277289039767019*a(n-12)+1833635961584793*a(n-13)-11096744989575192*a(n-14)+60836934331649002*a(n-15)-300697527739433007*a(n-16)+1351516144468885565*a(n-17)-5439120024495898964*a(n-18)+18628360424751121128*a(n-19)-51971399127676348053*a(n-20)+103075190607819796575*a(n-21)+54772783027825890748*a(n-22)-1868975980594211313002*a(n-23)+10073007274476850453689*a(n-24)-39702134001580584661727*a(n-25)+145384099850687466535124*a(n-26)-350624164973379182011856*a(n-27)+165557842525580943499031*a(n-28)+1096506153859094085557331*a(n-29)-7579296223516241637655112*a(n-30)+56544822046705427469350590*a(n-31)-165928092458001016764235132*a(n-32)+105703314424122533478395492*a(n-33)-372370636128533174312758112*a(n-34)+801114602608930615223990332*a(n-35)+15370592351331623873733320866*a(n-36)-44226644874854809861357466924*a(n-37)-18805302413271723047370433022*a(n-38)-163965524268674850446566664488*a(n-39)+730286945152862516052199029432*a(n-40)+3533295630667616329566311816772*a(n-41)-8739290770888142775588114464544*a(n-42)-15038595955148869223719511770152*a(n-43)-28840849090422888763239019064968*a(n-44)+181741289595634747858511529405440*a(n-45)+588454466712762120054780576634416*a(n-46)-1384796959233398678073157451306848*a(n-47)-3133981577605263809407257512969312*a(n-48)-1502112357367813785078199963489152*a(n-49)+24953300076487998134146844003565312*a(n-50)+56378446452323524121258184939583872*a(n-51)-167294181307118906631001019861587968*a(n-52)-302311941004550755369889268387868800*a(n-53)+284585846865183154493888442674473728*a(n-54)+1848450113220865178703699497752805376*a(n-55)+2022531954738831320655222375225596928*a(n-56)-12427740749028963023069057941056436224*a(n-57)-11045249538901496959095745191780747264*a(n-58)+45579641365419934584749141288540418048*a(n-59)+44675255339691062346571163988532432896*a(n-60)-66157797842757678522274227813055021056*a(n-61)-333673061704053266929637342087597850624*a(n-62)+116548086944325574573966084238073888768*a(n-63)+1710226188604281228397567765364131430400*a(n-64)-1405888791566005006988796358105607700480*a(n-65)-4379635416456263182371789392639036227584*a(n-66)+6693824798573659628905392215613738319872*a(n-67)+4104232439954093492253150399743712559104*a(n-68)-14220195586490576097266753684254041833472*a(n-69)+4379152083545016799696018289046765699072*a(n-70)+12964064095509508449553795138314219552768*a(n-71)-12686020216382443533244930305435214282752*a(n-72)-858422060413772578821473773518380335104*a(n-73)+7361773910710169150163552203445966471168*a(n-74)-4280553072283224828699951123447813242880*a(n-75)+830184179612653544164714599917027328000*a(n-76)
EXAMPLE
Some solutions for 4X3
..0..0..0....0..0..0....0..0..0....0..0..2....0..0..2....0..0..0....0..0..0
..1..1..2....1..0..0....3..1..3....0..3..3....3..0..0....2..3..2....1..3..3
..3..3..1....1..2..0....0..3..3....0..3..3....2..0..2....2..0..0....0..1..1
..0..0..3....1..0..0....0..3..3....3..0..0....0..0..2....3..3..2....2..1..1
CROSSREFS
Sequence in context: A304020 A305696 A184663 * A054730 A253379 A253372
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 19 2011
STATUS
approved

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Last modified April 19 12:06 EDT 2024. Contains 371792 sequences. (Running on oeis4.)