OFFSET
1,1
COMMENTS
Table starts
......315.....1095.....3705....12339....45585..161739..559305.2147931..7836561
.....1095.....2755.....7085....19119....62213..200215..645837.2386807..8440325
.....3705.....7085....14119....30681....86575..249953..747735.2652785..9085231
....12339....19119....30681....53739...127689..322275..878625.2967411..9800745
....45585....62213....86575...127689...247879..520289.1219455.3727073.11454631
...161739...200215...249953...322275...520289..904411.1782585.4808779.13539521
...559305...645837...747735...878625..1219455.1782585.2909367
..2147931..2386807..2652785..2967411..3727073.4808779
..7836561..8440325..9085231..9800745.11454631
.27667251.29121087.30632409.32238603
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..97
FORMULA
Empirical for columns 3 to at least 4: a(n)=6*a(n-1)-11*a(n-2)+129*a(n-3)-738*a(n-4)+1353*a(n-5)-6290*a(n-6)+33312*a(n-7)-61072*a(n-8)+155640*a(n-9)-733968*a(n-10)+1345608*a(n-11)-2177568*a(n-12)+8661600*a(n-13)-15879600*a(n-14)+18027792*a(n-15)-56197152*a(n-16)+103028112*a(n-17)-89177760*a(n-18)+197883648*a(n-19)-362786688*a(n-20)+256296960*a(n-21)-350479872*a(n-22)+642546432*a(n-23)-390790656*a(n-24)+241864704*a(n-25)-443418624*a(n-26)+241864704*a(n-27)
EXAMPLE
Some solutions with a(1,1)=0 for 5X4
..0..0..1..0....0..1..2..0....0..0..2..0....0..1..1..0....0..1..1..0
..0..1..1..2....0..2..0..0....0..2..0..0....0..1..0..0....0..1..0..0
..2..1..0..0....0..2..2..0....1..2..2..1....2..1..0..2....0..2..1..0
..1..0..0..1....0..2..1..0....0..0..2..0....1..1..0..1....1..0..1..1
..0..1..1..2....0..2..0..0....2..0..0..2....1..0..0..1....1..0..0..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Jan 15 2011
STATUS
approved