A251519 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock summing to 2 3 4 5 6 7 8 9 or 10

58618, 13580282, 3143505700, 727704325306, 168458473890432, 38996983803988656, 9027534432491502252, 2089812347474112645290, 483777234946451208966226, 111991114102820859573267808

Offset

1,1

Comments

Column 3 of A251524

Links

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

Formula

Empirical: a(n) = 225*a(n-1) +2020*a(n-2) -118805*a(n-3) -274529*a(n-4) +18217165*a(n-5) -41626758*a(n-6) -389697238*a(n-7) +754598477*a(n-8) +1991291650*a(n-9) -4108606440*a(n-10) -1995135464*a(n-11) +6354576576*a(n-12) -1281849696*a(n-13) -2223288576*a(n-14) +901255680*a(n-15)

Example

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

Crossrefs

Sequence in context: A075980 A031684 A031657 * A255781 A234447 A227601

Adjacent sequences: A251516 A251517 A251518 * A251520 A251521 A251522

Keyword

nonn

Author

R. H. Hardin, Dec 03 2014

Status

approved