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 A118551 a(0)=1. a(n) = a(n-1)*2, if n is in the sequence. a(n) = a(n-1) + 1 if n is missing from the sequence. 12
 1, 2, 4, 5, 10, 20, 21, 22, 23, 24, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 114, 228, 456, 912, 1824, 1825, 1826, 1827, 1828, 1829, 1830, 1831, 1832, 1833, 1834, 1835, 1836, 1837, 1838, 1839, 1840, 1841, 1842, 1843, 1844, 1845, 1846, 1847, 3694, 7388, 14776 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS MATHEMATICA f[s_] := Block[{n = Length@s}, Append[s, If[ MemberQ[s, n], 2s[[ -1]], s[[ -1]] + 1]]]; Nest[f, {1}, 50] - Robert G. Wilson v, May 16 2006 CROSSREFS Sequence in context: A000675 A005018 A249399 * A161706 A128401 A018467 Adjacent sequences:  A118548 A118549 A118550 * A118552 A118553 A118554 KEYWORD easy,nonn AUTHOR Leroy Quet, May 03 2006 EXTENSIONS More terms from Robert G. Wilson v, May 16 2006 STATUS approved

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Last modified October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)