A188275 Number of nondecreasing strings of numbers x(i=1..n) in -7..7 with sum x(i)^3 equal to 0.

1, 8, 8, 38, 42, 148, 202, 552, 890, 2020, 3566, 7176, 12928, 24098, 42656, 75315, 129065, 218078, 360564, 586492, 937076, 1474258, 2283944, 3489536, 5260144, 7831600, 11522100, 16764968, 24136482, 34405442, 48581032, 67985823, 94334343

Offset

1,2

Comments

Column 7 of A188277

Links

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

Example

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

Crossrefs

Sequence in context: A111218 A339340 A341247 * A319019 A278846 A339323

Adjacent sequences: A188272 A188273 A188274 * A188276 A188277 A188278

Keyword

nonn

Author

R. H. Hardin, Mar 26 2011

Status

approved