A233952 Number of (n+1)X(2+1) 0..5 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal

380, 2820, 20616, 152216, 1120996, 8268188, 60946532, 449407260, 3313237900, 24429430652, 180112793272, 1327993006976, 9791139758744, 72190609948984, 532256344763388, 3924338763672756, 28933966915286288, 213330346429898904

Offset

1,1

Comments

Column 2 of A233958

Links

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

Formula

Empirical: a(n) = 3*a(n-1) +76*a(n-2) -161*a(n-3) -1932*a(n-4) +3277*a(n-5) +22377*a(n-6) -32880*a(n-7) -128727*a(n-8) +173771*a(n-9) +368053*a(n-10) -472908*a(n-11) -488012*a(n-12) +600604*a(n-13) +270148*a(n-14) -316676*a(n-15) -46496*a(n-16) +44736*a(n-17) +6656*a(n-18) -256*a(n-19)

Example

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

Crossrefs

Sequence in context: A158597 A252122 A250635 * A259520 A188307 A214145

Adjacent sequences: A233949 A233950 A233951 * A233953 A233954 A233955

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved