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A188228 Number of nondecreasing arrangements of n numbers in -(n-1)..(n-1) with sum zero and not more than two numbers equal 1
1, 2, 4, 15, 58, 245, 1082, 5020, 24040, 118154, 592332, 3019280, 15604848, 81614541, 431227650, 2298833499, 12350952158, 66818754504, 363727676848, 1990946917066, 10952512200610, 60525264890259, 335856363303010, 1870732844007387 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A188236

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

All solutions for n=4

.-3...-1...-2...-3...-3...-2...-1...-2...-3...-2...-3...-1...-2...-2...-3

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

..1....0....1....1....2....1....1....2....3....0....0....0....0....1....2

..3....2....1....2....3....3....1....2....3....2....3....1....3....2....2

CROSSREFS

Sequence in context: A316726 A308345 A280065 * A243796 A153939 A112281

Adjacent sequences:  A188225 A188226 A188227 * A188229 A188230 A188231

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified May 16 08:07 EDT 2021. Contains 343940 sequences. (Running on oeis4.)