A233984 Number of (n+1)X(3+1) 0..4 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 10, and no two adjacent values equal

976, 9632, 92320, 914000, 8950496, 88388464, 869143232, 8570819600, 84375689440, 831554681360, 8189556095648, 80691702085856, 794817221203456, 7830541789521408, 77136359926894368, 759914432268558384

Offset

1,1

Comments

Column 3 of A233989

Links

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

Formula

Empirical: a(n) = 152*a(n-2) +150*a(n-3) -8071*a(n-4) -8102*a(n-5) +220582*a(n-6) +154134*a(n-7) -3549162*a(n-8) -957558*a(n-9) +35319910*a(n-10) -6392950*a(n-11) -218035822*a(n-12) +131758738*a(n-13) +804014815*a(n-14) -803217908*a(n-15) -1602211348*a(n-16) +2304441408*a(n-17) +1290558096*a(n-18) -3076728768*a(n-19) +201005888*a(n-20) +1628959232*a(n-21) -560044032*a(n-22) -245846016*a(n-23) +128188416*a(n-24) -7864320*a(n-25)

Example

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

Crossrefs

Sequence in context: A254072 A253363 A253907 * A205252 A190400 A288917

Adjacent sequences: A233981 A233982 A233983 * A233985 A233986 A233987

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved