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A251353 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than the absolute difference of its antidiagonal elements 1
2920, 137642, 6505867, 307396791, 14522811996, 686136478104, 32416955585740, 1531558664946401, 72359402605644368, 3418663231755377792, 161516789161897931030, 7630957302185381871107, 360529141480763613554961 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A251359
LINKS
FORMULA
Empirical: a(n) = 64*a(n-1) -996*a(n-2) +11578*a(n-3) -101830*a(n-4) +565355*a(n-5) -1946836*a(n-6) +4382875*a(n-7) -7058116*a(n-8) +8578826*a(n-9) -2416016*a(n-10) -37859617*a(n-11) +159993227*a(n-12) -380786469*a(n-13) +627428234*a(n-14) -768933079*a(n-15) +716269935*a(n-16) -490794809*a(n-17) +216766686*a(n-18) -25791720*a(n-19) -53590442*a(n-20) +66325899*a(n-21) -49766753*a(n-22) +26021030*a(n-23) -9346626*a(n-24) +2208580*a(n-25) -306048*a(n-26) +18432*a(n-27)
EXAMPLE
Some solutions for n=2
..3..0..2....0..2..2....2..0..2....2..2..3....2..1..2....0..2..0....0..2..2
..0..2..1....2..0..2....0..3..3....0..2..3....1..1..1....2..2..1....1..3..0
..1..3..1....2..2..1....3..0..3....1..3..1....1..0..3....2..0..0....2..1..2
CROSSREFS
Sequence in context: A054830 A031552 A205253 * A036260 A180651 A180331
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved

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Last modified May 23 22:02 EDT 2024. Contains 372765 sequences. (Running on oeis4.)