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A187461
Number of (n+1)X(n+1) 0..4 arrays with all the 2X2 subblocks nonsingular and the array of 2X2 subblock determinants symmetric
0
512, 84048, 100936174, 216668424092, 7540469990506332
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A187462
LINKS
Table of n, a(n) for n=1..5.
EXAMPLE
Some solutions for 4X4
..0..1..1..2....0..1..0..2....0..1..2..1....0..1..0..4....0..1..0..2
..1..0..1..4....1..0..1..0....1..0..2..0....1..0..1..0....1..0..1..3
..1..1..1..0....1..1..0..3....1..2..3..1....4..1..4..3....0..1..1..2
..2..4..0..1....3..1..3..1....2..2..4..3....4..0..3..1....2..1..0..3
CROSSREFS
Sequence in context: A186797 A183815 A013701 * A291461 A328200 A181244
Adjacent sequences: A187458 A187459 A187460 * A187462 A187463 A187464
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2011
STATUS
approved

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Last modified November 16 07:39 EST 2024. Contains 377784 sequences.
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