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A118551
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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.
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12
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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; internal format)
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OFFSET
| 0,2
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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 (rgwv(at)rgwv.com), May 16 2006
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CROSSREFS
| Sequence in context: A018424 A000675 A005018 * A161706 A128401 A018467
Adjacent sequences: A118548 A118549 A118550 * A118552 A118553 A118554
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KEYWORD
| easy,nonn
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AUTHOR
| Leroy Quet May 03 2006
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(at)rgwv.com), May 16 2006
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