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A195519 Number of lower triangles of an n X n -5..5 array with all row and column sums zero 0
1, 1, 11, 671, 401565, 2106810049, 103074513713971, 47878816111749257161 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Column 5 of A195522
LINKS
EXAMPLE
Some solutions for n=4
..0........0........0........0........0........0........0........0
..2-2......5-5......4-4......0.0......5-5.....-2.2......0.0.....-5.5
.-4.4.0...-1.3-2...-5.4.1...-1.2-1...-1.3-2....4.0-4...-1.4-3....3-5.2
..2-2.0.0.-4.2.2.0..1.0-1.0..1-2.1.0.-4.2.2.0.-2-2.4.0..1-4.3.0..2.0-2.0
CROSSREFS
Sequence in context: A211401 A036933 A195889 * A218716 A232355 A301732
KEYWORD
nonn
AUTHOR
R. H. Hardin Sep 20 2011
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)