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

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

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

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

Cf. A254989

Sequence in context: A254721 A257189 A254989 * A258511 A254998 A254991

Adjacent sequences: A254979 A254980 A254981 * A254983 A254984 A254985

Keyword

nonn

Author

R. H. Hardin, Feb 11 2015

Status

approved