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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 R. H. Hardin, Table of n, a(n) for n = 1..28 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 Adjacent sequences: A270500 A270501 A270502 * A270504 A270505 A270506 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.)