A256950 Number of (n+2) X (4+2) 0..1 arrays with every 3 X 3 subblock sum of the two sums of the central row and central column minus the two minimums of the diagonal and antidiagonal nondecreasing horizontally and vertically.

42890, 262251, 1015815, 2782301, 6304044, 11484877, 18040804, 26715881, 40022560, 56292649, 77255078, 102627725, 141269994, 188430201, 250036700, 319805527, 432798068, 574133619, 765221004, 970037933, 1331064994, 1795685605

Offset

1,1

Comments

Column 4 of A256954.

Links

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

Formula

Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) +5*a(n-4) -12*a(n-5) +5*a(n-6) -6*a(n-7) -a(n-8) +16*a(n-9) -a(n-10) +7*a(n-11) -13*a(n-12) -2*a(n-13) -13*a(n-14) +6*a(n-15) +2*a(n-16) +12*a(n-17) +2*a(n-18) -8*a(n-19) +8*a(n-20) -16*a(n-21) +8*a(n-22) for n>39.

Example

Some solutions for n=1
..1..0..0..1..1..0....1..1..1..0..0..1....1..1..1..1..1..0....0..0..0..0..1..0
..0..1..1..0..1..1....0..0..0..1..1..1....0..1..1..0..1..1....1..0..0..1..1..0
..0..0..0..1..0..0....1..1..0..1..1..1....1..0..1..1..1..1....1..1..1..1..0..1

Crossrefs

Cf. A256954.

Sequence in context: A014892 A255039 A255032 * A237847 A236984 A008850

Adjacent sequences: A256947 A256948 A256949 * A256951 A256952 A256953

Keyword

nonn

Author

R. H. Hardin, Apr 13 2015

Status

approved