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A252214 Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 5 6 or 7 1
1843, 1437, 3303, 10486, 35674, 122694, 420596, 1446932, 4990626, 17183216, 59122450, 203560298, 701041598, 2413836224, 8310468498, 28613117980, 98520290746, 339220390968, 1167963348088, 4021394031706, 13846106821196 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A252219

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +13*a(n-3) +31*a(n-4) +43*a(n-5) +25*a(n-6) -64*a(n-7) -125*a(n-8) -49*a(n-9) +79*a(n-10) +119*a(n-11) +20*a(n-12) -53*a(n-13) -42*a(n-14) -12*a(n-15) +6*a(n-16) +4*a(n-17) +4*a(n-18) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A257319 A287172 A243482 * A112017 A297894 A290393

Adjacent sequences:  A252211 A252212 A252213 * A252215 A252216 A252217

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2014

STATUS

approved

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Last modified October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)