A202961 - OEIS

A202961

Number of arrays of n+2 integers in -7..7 with sum zero and adjacent elements differing in absolute value

128, 1576, 17296, 207184, 2537024, 31155004, 384996502, 4786979780, 59791891464, 749603860520, 9427927830076, 118904758131236, 1503198371854568, 19043136745799960, 241690849746856584, 3072505406058890180

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 7 of A202962

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

..4...-3....6...-6...-4...-7...-1....1...-3....0....1...-7....0....0....5....1

..2....7....0....0...-6....1...-3....0...-4....7...-7...-1....2...-3....2....3

.-5....2...-7....5....0...-5....1....2....2...-6...-1....7....7....1...-4....1

..6....0...-6...-3....4....4....0...-5...-1...-3....2....2...-3....0...-1...-5

.-7...-6....7....4....6....7....3....2....6....2....5...-1...-6....2...-2....0

CROSSREFS

Sequence in context: A247930 A200842 A187706 * A239540 A327772 A306746

Adjacent sequences: A202958 A202959 A202960 * A202962 A202963 A202964

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 26 2011

STATUS

approved