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 A248460 Number of length n+2 0..7 arrays with no three consecutive terms having the sum of any two elements equal to twice the third 1
 432, 2956, 20236, 138534, 948412, 6493036, 44452660, 304332258, 2083523194, 14264241960, 97656029050, 668573914642, 4577199017242, 31336476646048, 214536174915418, 1468760220688680, 10055444434320028, 68841708367472026 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 7 of A248461 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 6*a(n-1) +9*a(n-2) -2*a(n-3) -109*a(n-4) -203*a(n-5) -4*a(n-6) +520*a(n-7) +1012*a(n-8) +696*a(n-9) +385*a(n-10) +373*a(n-11) -514*a(n-12) -2737*a(n-13) -4627*a(n-14) -3396*a(n-15) -2854*a(n-16) -3670*a(n-17) -2204*a(n-18) -634*a(n-19) -332*a(n-20) -162*a(n-21) -24*a(n-22) EXAMPLE Some solutions for n=4 ..0....4....7....2....1....2....0....6....1....7....0....4....1....4....0....0 ..4....5....0....4....4....5....0....5....4....2....1....5....0....7....2....1 ..4....2....7....5....0....6....3....5....1....0....4....2....7....3....7....5 ..3....4....4....4....5....1....2....6....4....2....3....2....1....1....6....1 ..7....7....3....0....6....5....6....0....1....2....7....7....5....0....6....2 ..1....0....6....5....0....7....5....2....6....3....6....1....0....1....1....7 CROSSREFS Sequence in context: A006910 A015229 A360840 * A234327 A174717 A235418 Adjacent sequences: A248457 A248458 A248459 * A248461 A248462 A248463 KEYWORD nonn AUTHOR R. H. Hardin, Oct 06 2014 STATUS approved

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Last modified June 17 23:25 EDT 2024. Contains 373468 sequences. (Running on oeis4.)