A251245 Number of (n+1)X(4+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements

42525, 7530633, 1333268433, 236035946835, 41786532918513, 7397658897202791, 1309640978922956217, 231851661109674461595, 41045747464323823946625, 7266514192354994223128283, 1286423850879599442443706681

Offset

1,1

Comments

Column 4 of A251249

Links

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

Formula

Empirical: a(n) = 243*a(n-1) -12974*a(n-2) +236322*a(n-3) -1209024*a(n-4) -2903472*a(n-5) +39230408*a(n-6) +36692136*a(n-7) -81363872*a(n-8) -13350417264*a(n-9) -31190025008*a(n-10) +131686132896*a(n-11) +557194797504*a(n-12) +324811988352*a(n-13) +44140742400*a(n-14) +1172245859712*a(n-15) +1535371786496*a(n-16) -166686769152*a(n-17) +514029736704*a(n-18) +114288768000*a(n-19) -43963103232*a(n-20) -23758092288*a(n-21) -13501624320*a(n-22) +51425280*a(n-23) +35831808*a(n-24)

Example

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

Crossrefs

Sequence in context: A217164 A062694 A210264 * A187959 A253521 A254419

Adjacent sequences: A251242 A251243 A251244 * A251246 A251247 A251248

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved