A250909 Number of (n+1)X(4+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

39960, 6621219, 1096982379, 181725094746, 30104106257115, 4986961280614953, 826125782084148708, 136853637633971644347, 22670782687226177355267, 3755577099313037361116844, 622138174177304855831638383

Offset: 1

Author

R. H. Hardin, Nov 28 2014

Keywords

• nonn

Comments

Column 4 of A250913

Examples

			Some solutions for n=1
..1..1..2..2..0....1..2..2..1..2....2..0..2..2..2....2..1..2..0..0
..1..0..0..0..1....1..2..1..1..2....1..0..1..1..2....2..1..0..0..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 202*a(n-1) -6346*a(n-2) +54499*a(n-3) -108047*a(n-4) +2308813*a(n-5) -8304217*a(n-6) -16011215*a(n-7) +3358369*a(n-8) [phone]*a(n-9) -60255820*a(n-10) [phone]*a(n-11) [phone]*a(n-12) -6773760*a(n-13)