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A252135
Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7
2
439, 1183, 5233, 22766, 96481, 409028, 1741344, 7424211, 31630024, 134638253, 573239601, 2441382308, 10396957389, 44272817558, 188528190392, 802834481181, 3418801560404, 14558580765955, 61996115520735, 264004067911860
OFFSET
1,1
COMMENTS
Column 4 of A252139
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +5*a(n-2) +14*a(n-3) +34*a(n-4) -16*a(n-5) -79*a(n-6) -150*a(n-7) -94*a(n-8) +581*a(n-9) +457*a(n-10) -913*a(n-11) -631*a(n-12) +692*a(n-13) +433*a(n-14) -236*a(n-15) -116*a(n-16) +72*a(n-17) -57*a(n-18) -32*a(n-19) +38*a(n-20) -15*a(n-21) +5*a(n-22) +11*a(n-23) -4*a(n-24) for n>26
EXAMPLE
Some solutions for n=4
..3..3..3..3..2..3....3..3..3..3..2..3....3..2..3..3..3..3....2..3..3..3..3..3
..3..3..3..3..3..3....3..3..3..3..3..3....2..3..3..3..3..3....3..3..3..3..3..2
..3..2..3..3..3..2....3..3..3..3..3..3....3..3..3..3..3..3....3..3..3..3..3..3
..3..3..3..3..3..3....3..3..3..3..2..3....3..2..3..3..3..3....3..3..2..3..3..3
..2..3..3..3..2..3....3..3..3..3..3..3....3..3..3..3..2..3....3..3..3..3..3..2
..3..3..2..3..3..3....2..3..3..3..3..3....2..3..3..3..3..3....3..3..3..2..3..3
CROSSREFS
Sequence in context: A142753 A142141 A050805 * A157737 A061328 A177489
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 14 2014
STATUS
approved