A203060 Number of nX2 0..6 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

7, 455, 16625, 491953, 14623955, 449303011, 13830934581, 423540231589, 12960863692877, 396932534594913, 12158312949466207, 372374419011765611, 11404358044432223467, 349276052222114506979, 10697191686358715474073

Offset

1,1

Comments

Column 2 of A203066

Links

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

Formula

Empirical: a(n) = 28*a(n-1) -119*a(n-2) +5320*a(n-3) +14657*a(n-4) +262356*a(n-5) +711785*a(n-6) +4372840*a(n-7) +8450903*a(n-8) +26917092*a(n-9) +32103217*a(n-10) +55870264*a(n-11) +31144464*a(n-12) +25401600*a(n-13)

Example

Some solutions for n=5
..4..1....6..1....6..6....6..0....6..2....4..3....6..1....1..0....1..6....2..2
..4..6....6..3....0..2....6..3....6..6....4..6....6..1....3..6....5..6....5..0
..0..6....3..5....0..1....3..4....5..1....5..6....1..3....0..6....1..0....5..5
..4..2....6..5....1..3....4..4....5..6....3..4....4..6....3..4....1..6....2..3
..6..6....6..2....6..6....1..1....5..6....6..6....5..6....5..5....6..6....4..4

Crossrefs

Sequence in context: A158599 A009660 A024097 * A261479 A241363 A196540

Adjacent sequences: A203057 A203058 A203059 * A203061 A203062 A203063

Keyword

nonn

Author

R. H. Hardin Dec 28 2011

Status

approved