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 A188230 Number of nondecreasing arrangements of n numbers in -(n+1)..(n+1) with sum zero and not more than two numbers equal 1
 1, 4, 12, 52, 221, 1019, 4818, 23522, 117209, 594789, 3062414, 15966168, 84132345, 447457816, 2399177028, 12956403904, 70416558196, 384897011042, 2114694606220, 11672750655842, 64705139473661, 360068911514032, 2010827078176568 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 3 of A188236 LINKS R. H. Hardin, Table of n, a(n) for n = 1..30 EXAMPLE Some solutions for n=4 .-3...-5...-5...-3...-3...-1...-4...-5...-4...-4...-2...-5...-4...-4...-4...-3 .-2...-5....0...-3....0...-1....1...-1...-2...-4...-2...-3...-1...-3...-3...-1 ..1....5....1....2....1....0....1....2....2....3....1....3....2....2....3....2 ..4....5....4....4....2....2....2....4....4....5....3....5....3....5....4....2 CROSSREFS Sequence in context: A149411 A149412 A109499 * A124006 A215524 A034716 Adjacent sequences:  A188227 A188228 A188229 * A188231 A188232 A188233 KEYWORD nonn AUTHOR R. H. Hardin Mar 24 2011 STATUS approved

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Last modified May 25 18:22 EDT 2013. Contains 225648 sequences.