A251279 Number of (n+1)X(4+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element

655040, 420152704, 269564757184, 172919373209920, 110920574724652544, 71150650646356529216, 45639971417777166667264, 29276004583234054916462336, 18779249931237017535248382976, 12046050411050830529395355630336

Offset

1,1

Comments

Column 4 of A251283

Links

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

Formula

Empirical: a(n) = 806*a(n-1) -111943*a(n-2) +4121346*a(n-3) -13373220*a(n-4) +518803126*a(n-5) +91027897588*a(n-6) -4223226636896*a(n-7) -3165566113410*a(n-8) +807830174039748*a(n-9) +2220446028051064*a(n-10) -29605166719379408*a(n-11) +234129791228315392*a(n-12) +1710848209648245632*a(n-13) -11053265657875185664*a(n-14) -52364613787367517184*a(n-15) +144900565749877080064*a(n-16) +435967705664201056256*a(n-17) -887491236069326815232*a(n-18) +852209893822362550272*a(n-19) -227064618958082015232*a(n-20) -407679314486819291136*a(n-21) -43925631376457465856*a(n-22) -2507350103656759296*a(n-23)

Example

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

Crossrefs

Sequence in context: A232675 A321064 A186614 * A205941 A365024 A287591

Adjacent sequences: A251276 A251277 A251278 * A251280 A251281 A251282

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved