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A116552 Anti-Harborth alternating chaotic sequence, 3rd type. 6
1, 3, 4, 9, 13, 12, 19, 27, 40, 39, 61, 36, 61, 57, 88, 81, 127, 120, 187, 117, 196, 183, 283, 108, 205, 183, 280, 171, 289, 264, 409, 243, 412, 381, 589, 360, 607, 561, 868, 351, 655, 588, 901, 549, 928, 849, 1315, 324, 715, 615, 928, 549, 937, 840, 1303, 513 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..2500

H. Harborth, Number of Odd Binomial Coefficients, Proc. Amer. Math. Soc. 62, 19-22, 1977.

Eric Weisstein's World of Mathematics, Stolarsky-Harborth Constant

FORMULA

From G. C. Greubel, Oct 30 2016: (Start)

a(2*n+1) = 3*a(n).

a(2*n+2) = 4*a(n) + a(n-1). (End)

MATHEMATICA

b[0] := 0; b[1] := 1; b[n_?EvenQ] := b[n] = 3*b[n/2]; b[n_?OddQ] := b[n] = 4*b[(n - 1)/2] + b[(n - 3)/2]; a = Table[b[n], {n, 1, 70}]

CROSSREFS

Cf. A116528, A116529, A116553, A116554, A116555.

Sequence in context: A029448 A249179 A103014 * A339996 A225288 A167930

Adjacent sequences:  A116549 A116550 A116551 * A116553 A116554 A116555

KEYWORD

nonn,obsc

AUTHOR

Roger L. Bagula, Mar 15 2006

EXTENSIONS

Name changed by G. C. Greubel, Oct 30 2016

STATUS

approved

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Last modified June 23 11:29 EDT 2021. Contains 345397 sequences. (Running on oeis4.)