login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A103458 a(n) = 7^n + 1 - 0^n. 1
1, 8, 50, 344, 2402, 16808, 117650, 823544, 5764802, 40353608, 282475250, 1977326744, 13841287202, 96889010408, 678223072850, 4747561509944, 33232930569602, 232630513987208, 1628413597910450, 11398895185373144 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n)^3 is palindromic in base 7 (1_7, 1331_7, 1030301_7, 1003003001_7, ...).

LINKS

Table of n, a(n) for n=0..19.

P. De Geest, World!Of Numbers

FORMULA

G.f.: (1-7*x^2)/((1-x)(1-7*x));

a(n) = Sum_{k=0..n} binomial(n, k)*0^(k(n-k))*7^k.

a(n) = A034491(n), n > 0. - R. J. Mathar, Aug 28 2008

a(n) = 7*a(n-1) - 6, with a(1)=8. - Vincenzo Librandi, Dec 29 2010

CROSSREFS

Cf. A046233.

Sequence in context: A287812 A180029 A133129 * A238841 A100310 A124963

Adjacent sequences:  A103455 A103456 A103457 * A103459 A103460 A103461

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Feb 07 2005

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 June 6 17:28 EDT 2020. Contains 334830 sequences. (Running on oeis4.)