A223676 Number of nX4 0..1 arrays with rows and antidiagonals unimodal

11, 121, 1118, 9822, 85663, 744272, 6458585, 56030742, 486038270, 4215998078, 36570143008, 317213501163, 2751542844692, 23867162292347, 207026174729348, 1795765890711121, 15576654086308004, 135113465080900087

Offset

1,1

Comments

Column 4 of A223680

Links

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

Formula

Empirical: a(n) = 11*a(n-1) -21*a(n-2) +18*a(n-3) -114*a(n-4) +183*a(n-5) -96*a(n-6) +80*a(n-7) -65*a(n-8) +16*a(n-9)

Example

Some solutions for n=3
..0..0..1..0....1..0..0..0....0..0..0..0....1..1..1..0....0..0..0..1
..0..0..0..0....1..0..0..0....1..1..1..1....1..0..0..0....0..0..1..0
..0..0..0..1....0..0..1..0....0..0..0..0....0..0..1..1....0..1..1..1

Crossrefs

Sequence in context: A307861 A106473 A125315 * A132583 A007907 A171285

Adjacent sequences: A223673 A223674 A223675 * A223677 A223678 A223679

Keyword

nonn

Author

R. H. Hardin Mar 25 2013

Status

approved