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A200552
Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.
1
154, 2134, 27806, 372150, 5012084, 68263780, 936121220, 12911643944, 178893425570, 2488110363432, 34717386812304, 485767803378730, 6813227225653584, 95761068651953630, 1348433104134460586
OFFSET
1,1
COMMENTS
Column 7 of A200553.
LINKS
EXAMPLE
Some solutions for n=3
.-6....1...-7....5....0...-6....4....1....1....0....1...-4....7...-6...-3....2
..2...-3....5...-4....2....5...-6...-2....3...-1....2....0...-1....6...-4....0
..1...-2....2...-1...-4....4...-2....5....1....5....1....3....4...-1...-2....3
..2....1...-3....5...-4....2....4...-3....2...-2...-5....2...-3....1....5...-5
..1....3....3...-5....6...-5....0...-1...-7...-2....1...-1...-7....0....4....0
CROSSREFS
Cf. A200553.
Sequence in context: A235107 A235100 A230804 * A160854 A159639 A160863
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 19 2011
STATUS
approved