A187984 Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*2^|x(i)| zero.

0, 5, 11, 39, 144, 467, 1673, 5825, 20404, 72246, 255137, 905611, 3220635, 11472797, 40956011, 146412581, 524169045, 1878990744, 6743276222, 24225861208, 87117117408, 313552816720, 1129460906243, 4071526431770, 14687417557462, 53016891233217, 191489301052386, 692020548649474, 2502200138127277, 9051895373199102, 32761105883346693

Offset: 1

Author

R. H. Hardin, Mar 18 2011

Keywords

• nonn

Examples

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

Crossrefs

Column 5 of A187988.

Extensions

Terms from a(16) on by R. J. Mathar, May 17 2023