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A183667 Number of (n+1) X 5 0..6 arrays with every 2 X 2 subblock summing to 12. 1
41209, 126223, 451801, 1803007, 7794409, 35840623, 173139001, 870960607, 4532521609, 24280115023, 133365034201, 748813846207, 4287144320809, 24977332069423, 147837168257401, 887722723579807, 5401539971032009 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A183672.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..90

FORMULA

Empirical: a(n) = 28*a(n-1) - 322*a(n-2) + 1960*a(n-3) - 6769*a(n-4) + 13132*a(n-5) - 13068*a(n-6) + 5040*a(n-7).

Empirical g.f.: x*(41209 - 1027629*x + 10186855*x^2 - 50973255*x^3 + 134336776*x^4 - 174117636*x^5 + 84707280*x^6) / ((1 - x)*(1 - 2*x)*(1 - 3*x)*(1 - 4*x)*(1 - 5*x)*(1 - 6*x)*(1 - 7*x)). - Colin Barker, Apr 02 2018

EXAMPLE

Some solutions for 3 X 5:

..0..2..5..4..3....1..4..2..6..0....3..4..2..2..3....1..4..4..2..1

..6..4..1..2..3....1..6..0..4..2....2..3..3..5..2....5..2..2..4..5

..1..1..6..3..4....4..1..5..3..3....3..4..2..2..3....2..3..5..1..2

CROSSREFS

Cf. A183672.

Sequence in context: A257429 A254238 A286891 * A188488 A027577 A235317

Adjacent sequences:  A183664 A183665 A183666 * A183668 A183669 A183670

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified September 30 14:38 EDT 2022. Contains 357106 sequences. (Running on oeis4.)