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

1,2

Comments

Column 5 of A187988

Links

Table of n, a(n) for n=1..31.

Example

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

Sequence in context: A369982 A212199 A276663 * A063626 A154297 A089441

Adjacent sequences: A187981 A187982 A187983 * A187985 A187986 A187987

Keyword

nonn

Author

R. H. Hardin Mar 18 2011

Extensions

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

Status

approved