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A200057
T(n,k)=Number of -k..k arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing
11
1, 1, 2, 1, 4, 4, 1, 6, 10, 4, 1, 8, 22, 26, 6, 1, 10, 36, 78, 68, 10, 1, 12, 56, 172, 288, 178, 14, 1, 14, 78, 324, 840, 1098, 472, 22, 1, 16, 106, 546, 1948, 4172, 4224, 1276, 34, 1, 18, 136, 850, 3914, 11962, 20978, 16432, 3462, 52, 1, 20, 172, 1252, 7074, 28554, 74338
OFFSET
1,3
COMMENTS
Table starts
..1....1......1.......1........1........1.........1..........1..........1
..2....4......6.......8.......10.......12........14.........16.........18
..4...10.....22......36.......56.......78.......106........136........172
..4...26.....78.....172......324......546.......850.......1252.......1764
..6...68....288.....840.....1948.....3914......7074......11862......18732
.10..178...1098....4172....11962....28554.....59910.....114232.....202314
.14..472...4224...20978....74338...211242....514168....1115572....2215290
.22.1276..16432..106674...466548..1577878...4453946...10995240...24477966
.34.3462..64310..545698..2947742.11867186..38855488..109147062..272432422
.52.9496.253692.2811236.18746754.89815404.341052122.1090022120.3050199016
LINKS
EXAMPLE
Some solutions for n=7 k=6
..3....0...-2....1....0...-3....0....0...-3....0...-3...-3....3...-3....0...-6
.-1...-3...-6....0...-1....6....2....5...-6....5...-6....0...-3...-2...-4....3
..0....5....6....3....6...-3...-2...-5....4...-5....3...-1....3...-3....4...-2
.-4....2...-5...-4...-3...-2....1....6...-5....6...-3....4...-5....1...-6....5
..4....4....1...-1...-1...-4...-5...-3....5...-3....6...-1....4...-1....6....1
.-3...-6....0...-3...-6....6....4....1...-1....2...-3....3...-3....6...-5....3
..1...-2....6....4....5....0....0...-4....6...-5....6...-2....1....2....5...-4
CROSSREFS
Column 1 is twice A077419 for n>1
Row 3 is twice A171769
Sequence in context: A115237 A105542 A208907 * A136600 A136672 A097750
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Nov 13 2011
STATUS
approved