A187985 Number of nondecreasing arrangements of n numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero.

0, 6, 13, 49, 181, 597, 2166, 7592, 26835, 95590, 339475, 1211024, 4324913, 15465952, 55398468, 198646230, 713134270, 2562757415, 9218114300, 33185957425, 119566240848, 431102833455, 1555423251527, 5615525795887, 20285623430206, 73320521305274, 265147098624058, 959309368316993, 3472389521265649

Offset: 1

Author

R. H. Hardin, Mar 18 2011

Keywords

• nonn

Examples

			All solutions for n=3
.-7...-5...-2...-4...-3...-6...-2...-3...-1...-1...-6...-5...-4
..6....4...-2...-4...-3...-6....1....2...-1....0....5...-5....3
..6....4....3....5....4....7....1....2....2....0....5....6....3
		

Crossrefs

Column 6 of A187988.

Extensions

Terms from a(14) on from R. J. Mathar, May 17 2023