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 A027562 Number of 5-unbalanced strings of length n (=2^n-A027560(n)). 0
 0, 0, 0, 0, 0, 0, 2, 6, 24, 62, 178, 426, 1070, 2444, 5720, 12662, 28392, 61464, 133980, 285304, 609750, 1282278, 2701396, 5626046, 11725614, 24234418, 50093914, 102905764, 211350724, 432051438, 882876204, 1797686520 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 COMMENTS a(n) is also the number of different ways to fold down a folding yardstick with n sticks (stick length is one) to form an equilateral hexagon with side length one. - Frank Hollstein, May 01 2019 LINKS Table of n, a(n) for n=0..31. Index entries for linear recurrences with constant coefficients, signature (3,3,-14,2,15,-6). FORMULA G.f.: 2x^6/[(1-2x)(1-3x^2)(1-x-2x^2+x^3)]. CROSSREFS Cf. A027560. Sequence in context: A357249 A107762 A253901 * A236625 A096259 A338614 Adjacent sequences: A027559 A027560 A027561 * A027563 A027564 A027565 KEYWORD nonn AUTHOR R. K. Guy, David Callan STATUS approved

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Last modified September 11 17:04 EDT 2024. Contains 375837 sequences. (Running on oeis4.)