A203931 Number of (n+1)X6 0..5 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

5797836, 1456391916, 428652828396, 132923754354276, 41849462653189056, 13240165438571137236, 4194818908674768075816, 1329613550411791356941796, 421496818837835140293344676, 133622819257731019101917616456

Offset

1,1

Comments

Column 5 of A203934

Links

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

Formula

Empirical: a(n) = 386*a(n-1) -15955*a(n-2) -2235050*a(n-3) +117771875*a(n-4) -1014525625*a(n-5) -17281937500*a(n-6) +226670750000*a(n-7) -231608437500*a(n-8) -3045281250000*a(n-9) +3447531250000*a(n-10) +4756093750000*a(n-11) -4337500000000*a(n-12)

Example

Some solutions for n=4
..5..4..0..2..4..5....0..5..4..5..5..5....2..0..1..1..0..4....1..5..5..2..0..1
..5..5..4..0..2..4....5..1..5..1..5..3....4..2..0..1..1..0....0..1..5..5..2..0
..3..5..5..4..0..2....3..5..0..5..4..5....3..4..2..0..1..1....5..0..1..5..5..2
..0..3..5..5..4..0....0..3..5..2..5..1....1..3..4..2..0..1....2..5..0..1..5..5
..4..0..3..5..5..4....1..0..3..5..0..5....5..1..3..4..2..0....3..2..5..0..1..5

Crossrefs

Sequence in context: A017480 A017612 A235983 * A309835 A321365 A335255

Adjacent sequences: A203928 A203929 A203930 * A203932 A203933 A203934

Keyword

nonn

Author

R. H. Hardin Jan 08 2012

Status

approved