A184434 Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i)^2 equal to n*4

1, 1, 3, 5, 8, 17, 31, 63, 129, 244, 458, 860, 1544, 2721, 4734, 8044, 13423, 22097, 35750, 57052, 89944, 139918, 215240, 327754, 493888, 737327, 1091368, 1601767, 2332587, 3372198, 4840788, 6903176, 9783032, 13780976, 19302810, 26891801

Offset

1,3

Comments

Column 2 of A184441

Links

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

Example

All solutions for n=5
..2....1....0....2....2....0....0....1
..2....0....2....0....0....2....0....1
..1....1....1....2....0....2....0....2
..0....2....1....1....2....0....0....0
..1....0....1....0....0....0....2....1

Crossrefs

Sequence in context: A174011 A291223 A240532 * A196140 A336016 A240154

Adjacent sequences: A184431 A184432 A184433 * A184435 A184436 A184437

Keyword

nonn

Author

R. H. Hardin Jan 14 2011

Status

approved