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A254982
Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally and vertically
2
512, 2642, 10285, 39891, 160753, 639228, 2462249, 9299264, 34829487, 129672792, 479519936, 1761693892, 6437736823, 23424213675, 84913778925, 306782012022, 1105018361491, 3969595351765, 14226219142333, 50874856344189
OFFSET
1,1
COMMENTS
Column 1 of A254989
LINKS
FORMULA
Empirical: a(n) = 7*a(n-1) -17*a(n-2) +26*a(n-3) -12*a(n-4) -92*a(n-5) +89*a(n-6) -116*a(n-7) -121*a(n-8) +727*a(n-9) +341*a(n-10) +262*a(n-11) +1668*a(n-12) -1380*a(n-13) -791*a(n-14) -5504*a(n-15) -1622*a(n-16) -1160*a(n-17) -1450*a(n-18) +18620*a(n-19) -316*a(n-20) +1254*a(n-21) -27288*a(n-22) +3524*a(n-23) +42952*a(n-24) -9576*a(n-25) -34248*a(n-26) +8272*a(n-27) +11264*a(n-28) -15296*a(n-29) +7200*a(n-30) +3168*a(n-31) -384*a(n-33) for n>38
EXAMPLE
Some solutions for n=4
..0..0..1....0..0..1....0..1..1....0..1..1....1..1..0....0..1..0....1..0..0
..0..0..1....1..1..1....0..0..0....1..0..1....0..0..1....0..0..0....0..0..1
..0..0..1....0..1..1....0..0..0....1..1..1....1..0..0....1..1..0....0..0..1
..0..1..1....1..1..1....0..0..0....0..1..1....0..0..1....0..1..1....1..0..1
..1..0..0....1..0..1....1..1..1....1..1..0....1..0..0....1..1..0....1..1..1
..1..0..1....1..0..0....1..1..0....1..1..1....1..1..1....0..0..1....0..1..0
CROSSREFS
Sequence in context: A254721 A257189 A254989 * A258511 A254998 A254991
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 11 2015
STATUS
approved