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 A270057 Number of nX7 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once. 1
 30720, 414705720, 3230189811360, 21244602958557060, 128543872461556329960, 739963061540157663852060, 4120579270516550893026428880, 22408736961354610893755135234040, 119718109679183490800236571685026760 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A270058. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 R. H. Hardin, Empirical recurrence of order 64 FORMULA Empirical recurrence of order 64 (see link above) EXAMPLE Some solutions for n=1 ..2..3..3..0..3..2..2. .4..2..2..0..1..1..0. .4..2..3..2..0..3..1 CROSSREFS Cf. A270058. Sequence in context: A236126 A236944 A269828 * A236899 A258891 A237469 Adjacent sequences: A270054 A270055 A270056 * A270058 A270059 A270060 KEYWORD nonn AUTHOR R. H. Hardin, Mar 09 2016 STATUS approved

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Last modified December 2 23:17 EST 2023. Contains 367526 sequences. (Running on oeis4.)