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A252208 Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 1 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 1 3 4 6 or 7 1
125554, 932474, 22430534, 84935426, 2778728210, 78534150994, 267361717782, 9906342079298, 303070072293522, 959873651074130, 38221223204833202, 1212189579390626626, 3685070395096108374, 152413070389286672834 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A252210

LINKS

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

FORMULA

Empirical: a(n) = 7180*a(n-3) -14766111*a(n-6) +8766317556*a(n-9) -103534211040*a(n-12) +266111582208*a(n-15) +103548977152*a(n-18) -274877906944*a(n-21) for n>24

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A048936 A237066 A224583 * A175691 A133220 A023086

Adjacent sequences:  A252205 A252206 A252207 * A252209 A252210 A252211

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2014

STATUS

approved

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Last modified May 11 18:21 EDT 2021. Contains 343808 sequences. (Running on oeis4.)