A232938 Number of nX5 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally

48, 120, 774, 4458, 26644, 157322, 932576, 5521380, 32701386, 193661452, 1146912480, 6792272698, 40225408560, 238224086698, 1410817796536, 8355186864526, 49481335558724, 293039831819072, 1735449179468938

Offset

1,1

Comments

Column 5 of A232941

Links

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

Formula

Empirical: a(n) = a(n-1) +21*a(n-2) +48*a(n-3) +14*a(n-4) -69*a(n-5) -38*a(n-6) +68*a(n-7) +13*a(n-8) -57*a(n-9) +37*a(n-10) -8*a(n-11) -2*a(n-12) +a(n-13) for n>14

Example

Some solutions for n=5
..2..2..2..2..2....2..1..2..2..1....2..2..2..2..1....1..2..1..2..1
..2..1..2..2..1....2..2..2..2..2....1..2..1..2..2....2..2..2..2..2
..2..2..1..2..2....2..2..2..1..2....2..2..2..2..1....2..1..2..2..2
..1..2..2..2..2....2..2..2..2..2....2..2..1..2..2....2..2..2..2..2
..2..2..2..2..2....1..2..2..2..1....2..2..2..2..1....2..2..2..2..1

Crossrefs

Sequence in context: A182679 A260759 A211726 * A362045 A194952 A260362

Adjacent sequences: A232935 A232936 A232937 * A232939 A232940 A232941

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved