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A270503 Number of nXnXn triangular 0..1 arrays with some element plus some adjacent element totalling 1+1 exactly once. 1
0, 3, 15, 126, 1149, 14220, 230247, 5038371, 149342775, 6042348225, 334920898542, 25514812957710, 2677815021433239, 387891078557649963, 77665115899526565021, 21520282031334054823482, 8260471327759688131895343 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 1 of A270509.
LINKS
EXAMPLE
Some solutions for n=4
.....0........0........1........1........1........1........0........0
....1.1......1.0......0.1......1.0......0.0......0.0......0.0......1.0
...0.0.0....0.0.0....1.0.0....0.0.0....0.0.1....1.0.0....0.0.1....0.0.0
..0.1.0.0..1.1.0.0..0.0.0.1..1.0.0.0..1.0.0.1..1.0.1.0..1.0.1.0..1.1.0.1
CROSSREFS
Cf. A270509.
Sequence in context: A251661 A230657 A246573 * A212553 A229673 A266091
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 18 2016
STATUS
approved

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Last modified June 19 14:12 EDT 2024. Contains 373503 sequences. (Running on oeis4.)