login
The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A091643 as a simple table

na(n)
14
219
3108
4687
54766
635139
7267486
82083814
916531372
10133059504
111082995490
128896945667
1373651718719
14613664827254

[4,19,108,687,4766,35139,267486,2083814,16531372,
 133059504,1082995490,8896945667,73651718719,
 613664827254]

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified January 18 03:12 EST 2025. Contains 379988 sequences.
License Agreements, Terms of Use, Privacy Policy