login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A206783
Number of nX6 0..1 arrays avoiding 0 0 1 horizontally and 0 1 1 vertically
1
33, 1089, 16109, 219061, 2431277, 25571618, 248652016, 2339185464, 21198003576, 188119640818, 1635325209384, 14020483612445, 118681118328599, 995030464602413, 8271058337085215, 68276292898767503, 560139098581304227
OFFSET
1,1
COMMENTS
Column 6 of A206785
LINKS
FORMULA
Empirical: a(n) = 27*a(n-1) -107*a(n-2) -3185*a(n-3) +29027*a(n-4) +139781*a(n-5) -2327849*a(n-6) -1428245*a(n-7) +105662367*a(n-8) -129799431*a(n-9) -3193684173*a(n-10) +7544465727*a(n-11) +69245484205*a(n-12) -223764545261*a(n-13) -1122099214761*a(n-14) +4519525668593*a(n-15) +13911288934347*a(n-16) -67918599438577*a(n-17) -133399761461023*a(n-18) +792919330213711*a(n-19) +987658801265267*a(n-20) -7379844512608923*a(n-21) -5519015759925929*a(n-22) +55718304920163387*a(n-23) +21508641782953623*a(n-24) -345580589204513115*a(n-25) -39371543655604643*a(n-26) +1777738636848552259*a(n-27) -170133186364396387*a(n-28) -7642764331604869131*a(n-29) +1986683057685806563*a(n-30) +27629996387624962513*a(n-31) -10774968741082518755*a(n-32) -84428373779009271125*a(n-33) +41653256962260701321*a(n-34) +219001939989526456293*a(n-35) -125997446101257208921*a(n-36) -483995268692229983823*a(n-37) +309544896684526926205*a(n-38) +914097310757231058795*a(n-39) -629517525258757238167*a(n-40) -1479063295748983129371*a(n-41) +1071644999873834867851*a(n-42) +2054342133457453563189*a(n-43) -1537734741180775506335*a(n-44) -2452762008660148219673*a(n-45) +1868216169649067453901*a(n-46) +2519295608483739586681*a(n-47) -1926897068906605457202*a(n-48) -2226400191629622129844*a(n-49) +1689530050198144236634*a(n-50) +1691882165594744704162*a(n-51) -1259655885417456961748*a(n-52) -1103994464225575489230*a(n-53) +797948696043437730714*a(n-54) +617134969905394288320*a(n-55) -428706868934114267472*a(n-56) -294538617968667727472*a(n-57) +194798308381292382304*a(n-58) +119471829288772072296*a(n-59) -74565045582299213304*a(n-60) -40940897432884828816*a(n-61) +23918369028584964896*a(n-62) +11762610613516563184*a(n-63) -6385735525173282080*a(n-64) -2806082625067609568*a(n-65) +1406511486464167296*a(n-66) +549032448028475840*a(n-67) -252666790405484928*a(n-68) -86715907293404224*a(n-69) +36462568792386176*a(n-70) +10826602168231808*a(n-71) -4141244602802432*a(n-72) -1038217562576384*a(n-73) +359654424009216*a(n-74) +73348023327744*a(n-75) -22887244918784*a(n-76) -3574721343488*a(n-77) +996785496064*a(n-78) +106647420928*a(n-79) -26222264320*a(n-80) -1456996352*a(n-81) +308281344*a(n-82)
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0....0..0..0..0..0..0....1..1..0..0..0..0....0..1..1..1..0..0
..0..1..0..0..0..0....0..1..1..1..0..1....1..0..1..0..0..0....1..0..1..1..1..0
..0..0..0..0..0..0....1..0..0..0..0..0....1..1..0..1..0..1....0..1..0..0..0..0
..1..0..1..1..0..1....0..0..0..0..0..0....0..0..0..0..0..0....1..0..1..1..0..1
CROSSREFS
Sequence in context: A188848 A188855 A207003 * A188520 A189261 A206892
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 12 2012
STATUS
approved