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A095902 Number of odd entries in A004001 that are <= 2^n. 3
1, 2, 2, 3, 6, 12, 27, 55, 115, 235, 490, 994, 2008, 4036, 8120, 16280, 32640, 65344, 130879, 261935, 524057, 1048301, 2096855, 4193951, 8388239, 16776799, 33554339, 67109539, 134220995 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Even entries and odd entries are equal only when n=4, 6 and 12. Past that, the evens outnumber the odds.

LINKS

Table of n, a(n) for n=0..28.

FORMULA

a(n) = A283480(2^n) - Antti Karttunen, Mar 21 2017

MATHEMATICA

a[1] = a[2] = 1; a[n_] := a[n] = a[a[n - 1]] + a[n - a[n - 1]]; c = 0; k = 1; Do[ While[k <= 2^n, If[ Mod[ a[k], 2] == 1, c++ ]; k++ ]; Print[c], {n, 21}]

PROG

(Scheme) (define (A095902 n) (A283480 (A000079 n))) ;; Antti Karttunen, Mar 21 2017

CROSSREFS

Cf. A000079, A004001, A095901, A283480.

Sequence in context: A064319 A307241 A064674 * A103687 A166678 A032908

Adjacent sequences:  A095899 A095900 A095901 * A095903 A095904 A095905

KEYWORD

more,nonn

AUTHOR

Robert G. Wilson v, Jun 12 2004

EXTENSIONS

a(22)-a(28) from Donovan Johnson, Jan 28 2009

STATUS

approved

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Last modified August 3 07:47 EDT 2021. Contains 346435 sequences. (Running on oeis4.)