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A256765 Number of (n+2)X(2+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum 1
1936, 14641, 81796, 456976, 2196324, 10556001, 46785600, 207360000, 878529600, 3722098081, 15374512036, 63506016016, 258598692676, 1053022816561, 4253774251024, 17183478927616, 69105769488144, 277918540050321 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A256771
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) +30*a(n-2) -230*a(n-3) -312*a(n-4) +3822*a(n-5) +534*a(n-6) -36354*a(n-7) +17505*a(n-8) +220020*a(n-9) -193524*a(n-10) -889056*a(n-11) +1056104*a(n-12) +2438976*a(n-13) -3613728*a(n-14) -4492832*a(n-15) +8271888*a(n-16) +5259072*a(n-17) -12868032*a(n-18) -3211008*a(n-19) +13425408*a(n-20) -181248*a(n-21) -8979456*a(n-22) +1806336*a(n-23) +3473408*a(n-24) -1179648*a(n-25) -589824*a(n-26) +262144*a(n-27)
EXAMPLE
Some solutions for n=3
..1..0..1..0....1..0..1..0....0..0..0..1....0..1..0..1....0..1..0..1
..1..1..1..0....1..1..0..0....0..0..0..1....1..1..0..1....0..0..1..0
..0..0..0..0....0..1..0..1....0..0..0..1....0..1..0..1....1..0..1..0
..1..1..1..1....0..0..1..1....1..0..1..1....0..1..1..1....0..1..1..1
..0..0..1..1....1..0..1..0....0..0..1..1....0..0..1..1....0..0..1..1
CROSSREFS
Sequence in context: A340843 A270265 A237010 * A264109 A188369 A185570
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2015
STATUS
approved

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Last modified May 27 13:56 EDT 2024. Contains 372861 sequences. (Running on oeis4.)