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 A270055 Number of nX5 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once. 1
 1280, 1683240, 1248460920, 779206497960, 446901694424400, 243724207420143600, 128543872461556329960, 66197363387248271149080, 33486151656718792957072320, 16705298615297314558207756320 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A270058. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 1084*a(n-1) -385060*a(n-2) +52207996*a(n-3) -3589359662*a(n-4) +139769030980*a(n-5) -3139297428484*a(n-6) +36970790802932*a(n-7) -109715789190473*a(n-8) -2264908466581072*a(n-9) +23041106193014144*a(n-10) -28405594469259904*a(n-11) -483359700838242304*a(n-12) +2011366933590159360*a(n-13) -2236659513127833600*a(n-14) for n>15 EXAMPLE Some solutions for n=1 ..1..1..3..4..2. .0..4..1..1..4. .2..4..0..1..4. .1..2..2..3..0 CROSSREFS Cf. A270058. Sequence in context: A090006 A170784 A269826 * A252116 A084803 A104399 Adjacent sequences: A270052 A270053 A270054 * A270056 A270057 A270058 KEYWORD nonn AUTHOR R. H. Hardin, Mar 09 2016 STATUS approved

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Last modified December 10 12:10 EST 2023. Contains 367710 sequences. (Running on oeis4.)