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A251486 Number of (n+1)X(3+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements 1
50576, 10046784, 1996407424, 396684056960, 78819515764397, 15661071542167376, 3111780313414886566, 618295855606419707392, 122852424799301062666424, 24410188232939001443671104, 4850187451303376251467769813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251491

LINKS

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

FORMULA

Empirical: a(n) = 256*a(n-1) -12199*a(n-2) +163792*a(n-3) -450614*a(n-4) -999872*a(n-5) +26782853*a(n-6) -398145776*a(n-7) -1637661603*a(n-8) +5238219360*a(n-9) +12853712360*a(n-10) -27723613504*a(n-11) -38172377104*a(n-12) +34500091392*a(n-13) +70834593600*a(n-14) -41937979392*a(n-15) +11349974016*a(n-16)

EXAMPLE

Some solutions for n=1

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

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

CROSSREFS

Sequence in context: A302902 A317285 A253032 * A268469 A250442 A183824

Adjacent sequences:  A251483 A251484 A251485 * A251487 A251488 A251489

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2014

STATUS

approved

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Last modified January 23 23:01 EST 2022. Contains 350515 sequences. (Running on oeis4.)