

A116554


AntiHarborth alternating chaotic sequence, 5th type.


6



1, 7, 8, 49, 57, 56, 71, 343, 400, 399, 505, 392, 505, 497, 624, 2401, 2815, 2800, 3543, 2793, 3592, 3535, 4439, 2744, 3641, 3535, 4432, 3479, 4481, 4368, 5489, 16807, 19832, 19705, 24921, 19600, 25215, 24801, 31144, 19551, 25887, 25144, 31529
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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, 1922, 1977.
Eric Weisstein's World of Mathematics, StolarskyHarborth Constant


FORMULA

From G. C. Greubel, Oct 30 2016: (Start)
a(2*n+1) = 7*a(n).
a(2*n+2) = 8*a(n) + a(n1). (End)


MATHEMATICA

b[0] := 0; b[1] := 1; b[n_?EvenQ] := b[n] = 7*b[n/2]; b[n_?OddQ] := b[n] = 8*b[(n  1)/2] + b[(n  3)/2]; a = Table[b[n], {n, 1, 70}]


CROSSREFS

Cf. A116528, A116529, A116552, A116553, A116555.
Sequence in context: A033044 A025630 A036566 * A038274 A201919 A249310
Adjacent sequences: A116551 A116552 A116553 * A116555 A116556 A116557


KEYWORD

nonn,obsc


AUTHOR

Roger L. Bagula, Mar 15 2006


EXTENSIONS

Edited by N. J. A. Sloane, Fab 11 2007
Name changed by G. C. Greubel, Oct 30 2016


STATUS

approved



