A254581 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and the central column and the two maximums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally

15051, 96756, 774168, 5852880, 42278366, 305579066, 2204567802, 15863354126, 114154509258, 821370106542, 5908977818626, 42506746305410, 305774829560554, 2199561125832150, 15822198618645370, 113813904113232982

Offset

1,1

Comments

Column 3 of A254586

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +20*a(n-2) -58*a(n-3) -54*a(n-4) -912*a(n-5) -345*a(n-6) +4548*a(n-7) +3996*a(n-8) +7744*a(n-9) -19200*a(n-10) -44864*a(n-11) +45920*a(n-12) +28416*a(n-13) -66176*a(n-14) +21504*a(n-15) +52224*a(n-16) -16384*a(n-17) -16384*a(n-18) for n>25

Example

Some solutions for n=2
..1..0..1..0..1....0..0..1..1..1....0..1..0..1..1....1..0..0..0..1
..0..0..0..1..1....0..0..0..0..1....0..0..0..1..1....0..0..1..0..1
..0..0..1..1..0....1..1..1..1..1....0..1..1..1..1....1..0..1..0..1
..1..0..1..0..0....0..0..0..0..1....1..0..1..0..0....0..0..1..1..0

Crossrefs

Sequence in context: A205022 A207297 A151595 * A254588 A254356 A187423

Adjacent sequences: A254578 A254579 A254580 * A254582 A254583 A254584

Keyword

nonn

Author

R. H. Hardin, Feb 01 2015

Status

approved