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A252422 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 5 6 or 7 1
5725, 12214, 53782, 113324, 715123, 3582225, 7509929, 47586055, 239646231, 500354430, 3170646607, 15978230331, 33346465798, 211307919221, 1064963403405, 2222470763470, 14083175964469, 70978102590637, 148123236212674 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A252423

LINKS

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

FORMULA

Empirical: a(n) = 94*a(n-3) -2103*a(n-6) +20000*a(n-9) -92106*a(n-12) +209364*a(n-15) -240176*a(n-18) +130272*a(n-21) -25344*a(n-24) for n>33

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A253423 A202376 A330208 * A183647 A028547 A224726

Adjacent sequences:  A252419 A252420 A252421 * A252423 A252424 A252425

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified May 16 08:07 EDT 2021. Contains 343940 sequences. (Running on oeis4.)