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A193709
Number of arrays of -7..7 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero
1
1, 15, 183, 2689, 18789, 182477, 1749091, 16567391, 152394383, 1433139483, 13442332537, 125848692733, 1177478188091, 11030361936285, 103297490194959, 967247732981943, 9057265482772319, 84816644335515109, 794242509585815241
OFFSET
1,2
COMMENTS
Column 7 of A193710
LINKS
EXAMPLE
Some solutions for n=6
.-7...-6....2....4....0...-3...-7...-7....0....1....1....3...-3...-4...-7....1
..7....1....0...-5...-1...-1....7....7....4...-1...-1....2....3....2...-1...-2
.-5....5...-2....7....1....2...-5...-1....3...-7....2....1...-2....2....3....1
..1....4...-5...-6...-2....2....1....3...-7....7....7...-6...-6...-2....5...-4
..3...-4....4....3....7....0....6...-4...-1...-2...-7...-1....6....4....6...-3
..1....4....3...-3...-6...-2...-2....2....5....2...-2....1....2...-2...-6....7
CROSSREFS
Sequence in context: A335509 A193701 A125450 * A157689 A273654 A079516
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 02 2011
STATUS
approved