A258521 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically

6516, 13616, 19920, 25076, 25532, 23907, 23398, 26321, 30168, 33303, 35726, 37801, 40964, 45772, 52250, 58011, 62266, 68264, 77152, 89383, 98654, 107242, 119496, 135431, 157308, 174258, 192562, 217067, 245492, 287238, 320266, 357737, 405498

Offset

1,1

Comments

Column 3 of A258522

Links

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

Formula

Empirical: a(n) = a(n-4) +4*a(n-5) -4*a(n-9) -5*a(n-10) +5*a(n-14) +2*a(n-15) -2*a(n-19) for n>39

Example

Some solutions for n=4
..0..1..1..1..0....0..0..0..1..1....0..0..0..0..0....1..0..1..1..1
..0..1..1..0..0....0..1..1..0..1....1..1..1..0..0....1..1..1..0..0
..0..1..1..0..0....0..1..1..0..1....0..1..1..0..0....0..1..0..0..1
..1..1..0..0..1....1..1..0..0..1....1..1..0..0..0....0..1..0..0..1
..1..1..0..0..1....0..1..1..1..0....1..0..0..1..0....1..0..0..0..1
..0..1..1..0..0....1..1..1..1..1....1..1..1..0..0....1..0..1..1..1

Crossrefs

Cf. A258522

Sequence in context: A251447 A156416 A156418 * A068270 A216666 A260979

Adjacent sequences: A258518 A258519 A258520 * A258522 A258523 A258524

Keyword

nonn

Author

R. H. Hardin, Jun 01 2015

Status

approved