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A252410 Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7 1
319, 688, 1515, 2555, 7425, 18377, 32710, 97923, 245711, 440341, 1327285, 3343809, 6005069, 18174197, 45900357, 82546379, 250597823, 634117095, 1141608889, 3474085061, 8803935237, 15862997397, 48363153977, 122700674105, 221224063343 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A252407

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-3) -179*a(n-6) +122*a(n-9) +562*a(n-12) -680*a(n-15) -425*a(n-18) +768*a(n-21) +19*a(n-24) -236*a(n-27) +24*a(n-30) for n>37

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A153048 A053020 A250660 * A064905 A293921 A121010

Adjacent sequences:  A252407 A252408 A252409 * A252411 A252412 A252413

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified April 22 12:08 EDT 2021. Contains 343177 sequences. (Running on oeis4.)