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 A065495 Number of (binary) bit strings of length n in which an odd length block of 0's is followed by an odd length block of 1's. 3
 1, 2, 6, 14, 32, 72, 156, 336, 712, 1496, 3120, 6464, 13328, 27360, 55968, 114144, 232192, 471296, 954816, 1931264, 3900800, 7869312, 15858432, 31928832, 64232704, 129128960, 259431936, 520941056, 1045557248, 2097616896 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,2 LINKS Table of n, a(n) for n=2..31. Index entries for linear recurrences with constant coefficients, signature (2,2,-2,-4). FORMULA G.f.: x^2/((1-2*x)*(1-2*x^2-2*x^3)). EXAMPLE a(4) = 6 because of 0100, 0101, 1010, 1101, 0111, 0001. CROSSREFS Cf. A061279 [=2^n - a(n)], A065455, A065494, A065497. Sequence in context: A232434 A096238 A074878 * A131352 A232230 A294780 Adjacent sequences: A065492 A065493 A065494 * A065496 A065497 A065498 KEYWORD nonn,easy AUTHOR Len Smiley, Nov 24 2001 STATUS approved

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Last modified September 7 23:52 EDT 2024. Contains 375749 sequences. (Running on oeis4.)