

A199826


Number of 2..2 arrays x(0..n+1) of n+2 elements with zero sum and no two neighbors summing to zero


1



10, 40, 114, 426, 1650, 6126, 23206, 88636, 337866, 1295566, 4992364, 19269156, 74529210, 288954786, 1122363984, 4366362420, 17011617426, 66365823648, 259213619826, 1013542247970, 3966939195402, 15540399135516, 60929935280508
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Column 2 of A199832


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200


EXAMPLE

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


CROSSREFS

Sequence in context: A063490 A251121 A002419 * A227056 A027981 A013977
Adjacent sequences: A199823 A199824 A199825 * A199827 A199828 A199829


KEYWORD

nonn


AUTHOR

R. H. Hardin Nov 11 2011


STATUS

approved



