A250959 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element

1592, 34988, 768855, 17233753, 390286993, 8862302446, 201262465235, 4569607131470, 103739106695861, 2355008989687901, 53461607407483892, 1213647749121049774, 27551416544578721659, 625454009044940247545

Offset

1,1

Comments

Column 2 of A250965

Links

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

Formula

Empirical: a(n) = 64*a(n-1) -1748*a(n-2) +28346*a(n-3) -310754*a(n-4) +2462920*a(n-5) -14717932*a(n-6) +68296776*a(n-7) -251551335*a(n-8) +747834819*a(n-9) -1817725856*a(n-10) +3647857862*a(n-11) -6087841866*a(n-12) +8491206253*a(n-13) -9927412988*a(n-14) +9738203645*a(n-15) -8005861493*a(n-16) +5496893372*a(n-17) -3132361554*a(n-18) +1466713771*a(n-19) -555901930*a(n-20) +166711184*a(n-21) -38185312*a(n-22) +6298320*a(n-23) -669024*a(n-24) +34560*a(n-25)

Example

Some solutions for n=2
..2..3..0....2..2..0....2..0..0....1..1..0....2..3..3....2..1..0....1..3..0
..0..0..0....1..1..1....0..0..0....3..2..2....2..3..3....3..1..1....1..2..2
..1..2..2....0..3..2....1..1..3....0..1..3....1..1..2....0..0..0....0..1..3

Crossrefs

Sequence in context: A252085 A224948 A238075 * A224943 A045273 A316336

Adjacent sequences: A250956 A250957 A250958 * A250960 A250961 A250962

Keyword

nonn

Author

R. H. Hardin, Nov 29 2014

Status

approved