A187986 Number of nondecreasing arrangements of n numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*2^|x(i)| zero.

0, 7, 15, 60, 222, 746, 2742, 9689, 34588, 124062, 443469, 1591177, 5710783, 20514746, 73779819, 265523140, 956384656, 3447285428, 12433999199, 44877035870, 162066465738, 585603996081, 2117103447068, 7657611562951, 27710598382843, 100320181906860, 363337451934873, 1316442508560564

Offset: 1

Author

R. H. Hardin, Mar 18 2011

Keywords

• nonn

Examples

			All solutions for n=3
.-8...-1...-3...-6...-2...-4...-7...-7...-4...-2...-5...-5...-3...-1...-6
..7....0...-3....5....1...-4...-7....6....3...-2....4...-5....2...-1...-6
..7....0....4....5....1....5....8....6....3....3....4....6....2....2....7
		

Crossrefs

Column 7 of A187988.

Extensions

More terms from R. J. Mathar, May 17 2023