login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A001139 as a simple table

na(n)
21
33
421
56615
664595475

[1,3,21,6615,64595475]

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 October 19 23:26 EDT 2024. Contains 376945 sequences.
License Agreements, Terms of Use, Privacy Policy