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A095720 a(1)=1 and, for n>1, a(n)=a(n-1)+Floor(3n/4) if n is even, else a(n)=smallest positive integer which has not yet appeared in the sequence. 0
1, 3, 2, 5, 4, 8, 6, 12, 7, 15, 9, 18, 10, 20, 11, 23, 13, 27, 14, 29, 16, 32, 17, 35, 19, 39, 21, 42, 22, 44, 24, 48, 25, 51, 26, 53, 28, 56, 30, 60, 31, 63, 33, 66, 34, 68, 36, 72, 37, 75, 38, 77, 40, 80, 41, 83, 43, 87, 45, 90, 46, 92, 47, 95, 49, 99, 50, 101, 52, 104, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Conjecture. For even n, the ratio a(n)/a(n-1) is asymptotic to 2 as n becomes large. (At n=3000, the ratio is 2.0004446.)

LINKS

Table of n, a(n) for n=1..71.

CROSSREFS

Cf. A094077.

Sequence in context: A340286 A194078 A169752 * A318460 A276582 A240729

Adjacent sequences:  A095717 A095718 A095719 * A095721 A095722 A095723

KEYWORD

nonn

AUTHOR

John W. Layman, Jul 08 2004

STATUS

approved

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Last modified September 23 07:00 EDT 2021. Contains 347609 sequences. (Running on oeis4.)