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A200453 Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences. 1
142, 1832, 22276, 278906, 3513884, 44716536, 572857272, 7380022092, 95496980144, 1240352594210, 16161267003100, 211148128583658, 2765181621011902, 36287540439791446, 477071904597059874, 6282247056373911518 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A200454.
LINKS
EXAMPLE
Some solutions for n=3
.-1...-4....0....7....5....5....6...-4....2....0...-1...-5....4....2...-6...-6
.-3....3....2....0...-1....2...-2....6....3....4....2....6...-5....3...-1....7
..4....4...-5...-1...-2...-6...-4....4...-5...-1...-3....1....1...-4....1...-6
.-5...-3....3...-4...-4...-4...-7....0...-1...-4....4...-5...-3....3....6....2
..5....0....0...-2....2....3....7...-6....1....1...-2....3....3...-4....0....3
CROSSREFS
Sequence in context: A092230 A259422 A219146 * A283638 A235457 A200557
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 18 2011
STATUS
approved

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Last modified May 23 20:54 EDT 2024. Contains 372765 sequences. (Running on oeis4.)