login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A116554 Anti-Harborth 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 (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) = 7*a(n).

a(2*n+2) = 8*a(n) + a(n-1). (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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 23:21 EDT 2019. Contains 328379 sequences. (Running on oeis4.)