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A251024 Number of (n+1)X(4+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 1
6321, 23404, 51347, 119632, 257578, 563271, 1199576, 2590598, 5601754, 12305560, 27283810, 61222845, 138410707, 315015070, 719847225, 1649954072, 3788495903, 8709393619, 20035602376, 46111319584, 106149006168, 244393023772 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A251028

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -25*a(n-2) +35*a(n-3) -7*a(n-4) -49*a(n-5) +77*a(n-6) -55*a(n-7) +20*a(n-8) -3*a(n-9) for n>14

EXAMPLE

Some solutions for n=4

..0..0..1..2..3....0..0..0..1..0....0..0..0..0..2....0..2..2..2..3

..0..0..0..0..1....2..0..0..1..0....0..0..0..0..2....1..0..0..0..1

..2..2..2..2..2....2..0..0..1..0....0..0..0..0..2....1..0..0..0..1

..0..0..0..0..0....2..0..0..1..0....0..0..0..0..2....1..0..0..0..1

..3..3..3..3..1....3..1..1..1..0....2..2..1..1..1....2..0..0..0..1

CROSSREFS

Sequence in context: A189344 A054560 A069428 * A213993 A252268 A292715

Adjacent sequences:  A251021 A251022 A251023 * A251025 A251026 A251027

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified August 18 21:24 EDT 2022. Contains 356215 sequences. (Running on oeis4.)