A252240 - OEIS

A252240

Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum not equal to 1 3 4 6 or 7 and every 3 X 3 diagonal and antidiagonal sum equal to 1 3 4 6 or 7.

13376, 215424, 2908368, 11206944, 193004352, 2778727776, 10519316352, 185237247744, 2757905884800, 10320806426112, 183760175803392, 2783001368928768, 10347503929104384, 185246818559668224

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OFFSET

1,1

COMMENTS

Column 5 of A252243.

LINKS

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

FORMULA

Empirical: a(n) = 1804*a(n-3) -939040*a(n-6) +145285120*a(n-9) -1639972864*a(n-12) +4294967296*a(n-15) for n>16.

EXAMPLE

Some solutions for n=1

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