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A184132
Number of nX4 0..2 arrays with rows and columns in nondecreasing order
1
15, 356, 10020, 250841, 5136783, 86649029, 1235699769, 15270848022, 166834456961, 1636866521557, 14604220409727, 119695566470666, 908732269828858, 6435563608860009, 42766741187832311, 268044686453407075
OFFSET
1,1
COMMENTS
Column 4 of A184137
LINKS
FORMULA
Empirical: a(n)=81*a(n-1)-3240*a(n-2)+85320*a(n-3)-1663740*a(n-4)+25621596*a(n-5)-324540216*a(n-6)+3477216600*a(n-7)-32164253550*a(n-8)+260887834350*a(n-9)-1878392407320*a(n-10)+12124169174520*a(n-11)-70724320184700*a(n-12)+375382930211100*a(n-13)-1823288518168200*a(n-14)+8144022047817960*a(n-15)-33594090947249085*a(n-16)+128447994798305325*a(n-17)-456703981505085600*a(n-18)+1514334254464231200*a(n-19)-4694436188839116720*a(n-20)+13636219405675529520*a(n-21)-37189689288205989600*a(n-22)+95399637739311016800*a(n-23)-230549124536668290600*a(n-24)+525652003943603702568*a(n-25)-1132173546955454128608*a(n-26)+2306279447501851002720*a(n-27)-4447824648753569790960*a(n-28)+8128782978756524100720*a(n-29)-14089890496511308441248*a(n-30)+23180142429744410661408*a(n-31)-36218972546475641658450*a(n-32)+53779686508403225492850*a(n-33)-75924263305981024225200*a(n-34)+101955439296603089673840*a(n-35)-130276394656770614583240*a(n-36)+158444263771748044763400*a(n-37)-183461779104129314989200*a(n-38)+202278371832757962680400*a(n-39)-212392290424395860814420*a(n-40)+212392290424395860814420*a(n-41)-202278371832757962680400*a(n-42)+183461779104129314989200*a(n-43)-158444263771748044763400*a(n-44)+130276394656770614583240*a(n-45)-101955439296603089673840*a(n-46)+75924263305981024225200*a(n-47)-53779686508403225492850*a(n-48)+36218972546475641658450*a(n-49)-23180142429744410661408*a(n-50)+14089890496511308441248*a(n-51)-8128782978756524100720*a(n-52)+4447824648753569790960*a(n-53)-2306279447501851002720*a(n-54)+1132173546955454128608*a(n-55)-525652003943603702568*a(n-56)+230549124536668290600*a(n-57)-95399637739311016800*a(n-58)+37189689288205989600*a(n-59)-13636219405675529520*a(n-60)+4694436188839116720*a(n-61)-1514334254464231200*a(n-62)+456703981505085600*a(n-63)-128447994798305325*a(n-64)+33594090947249085*a(n-65)-8144022047817960*a(n-66)+1823288518168200*a(n-67)-375382930211100*a(n-68)+70724320184700*a(n-69)-12124169174520*a(n-70)+1878392407320*a(n-71)-260887834350*a(n-72)+32164253550*a(n-73)-3477216600*a(n-74)+324540216*a(n-75)-25621596*a(n-76)+1663740*a(n-77)-85320*a(n-78)+3240*a(n-79)-81*a(n-80)+a(n-81) (=polynomial of degree 80)
EXAMPLE
Some solutions for 3X4
..0..0..0..1....0..0..1..2....0..0..1..2....0..0..1..2....0..0..1..2
..0..0..1..1....2..2..2..2....0..1..1..2....1..2..1..1....0..1..1..2
..2..2..2..1....2..2..2..2....2..1..1..0....2..0..1..2....1..0..0..1
CROSSREFS
Sequence in context: A030049 A240375 A202809 * A240197 A012486 A035020
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 09 2011
STATUS
approved