A195893 - OEIS

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A195893

Number of lower triangles of a 5X5 integer array with all row and column sums zero and all row and column sums of squares <= 2n^2

83, 1349, 14831, 68551, 241221, 680115, 1686561, 3665777, 7197327, 13441577, 23509903, 38130019, 62475265, 96810419, 144798413, 211419333, 301429771, 421198113, 580071707, 789348015, 1055270897, 1390678351, 1808027465

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 5 of A195892

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..55

EXAMPLE

Some solutions for n=4

..0..........0..........0..........0..........0..........0..........0

..3-3.......-3.3.......-3.3.......-2.2.......-1.1.......-4.4........1-1

.-2.4-2......0-2.2......4-3-1......3-3.0......3.1-4.....-1-1.2.....-4.3.1

.-2-2.0.4....3.1.0-4...-1.0.4-3....2.2.0-4...-1.0.2-1....3-1-4.2....2.2-1-3

..1.1.2-4.0..0-2-2.4.0..0.0-3.3.0.-3-1.0.4.0.-1-2.2.1.0..2-2.2-2.0..1-4.0.3.0

CROSSREFS

Sequence in context: A068851 A250083 A292284 * A233332 A175662 A103233

Adjacent sequences: A195890 A195891 A195892 * A195894 A195895 A195896

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 24 2011

STATUS

approved