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A188227 Number of nondecreasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero and not more than two numbers equal 1
1, 3, 12, 81, 598, 4859, 41748, 374820, 3475284, 33053399, 320869264, 3167899567, 31721907390, 321494911644, 3292220700520, 34018798556265, 354312456839426, 3716173628641396, 39220841304052510, 416264662788000213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A188236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=4

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

.-1....0...-2...-1...-1...-2...-1....0....1...-1...-1...-3...-2...-4...-1...-4

..1....1....0....1...-1....1....2....2....1....2....2....3....2....4....0....2

..1....2....5....3....6....6....5....3....2....4....2....3....2....6....3....6

CROSSREFS

Sequence in context: A197445 A303033 A207322 * A224608 A023881 A067111

Adjacent sequences:  A188224 A188225 A188226 * A188228 A188229 A188230

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified October 21 17:37 EDT 2021. Contains 348155 sequences. (Running on oeis4.)