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A251875 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7 1
32372, 99808, 40816, 62720, 267872, 506656, 893120, 3499888, 8000000, 15317248, 56450688, 146923792, 294439232, 1049159568, 2916709968, 5965120064, 20941831888, 59901392016, 123522690880, 431054317328, 1247133093840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A251876

LINKS

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

FORMULA

Empirical: a(n) = 29*a(n-3) -168*a(n-6) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A218574 A145871 A137283 * A156038 A156048 A234224

Adjacent sequences:  A251872 A251873 A251874 * A251876 A251877 A251878

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 10 2014

STATUS

approved

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Last modified April 13 10:24 EDT 2021. Contains 342935 sequences. (Running on oeis4.)