cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A340904 a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * sigma_1(k) * a(n-k).

Table of values

n a(n)
0 1
1 1
2 5
3 28
4 225
5 2206
6 26174
7 361278
8 5704401
9 101297701
10 1998893240
11 43386854622
12 1027353587730
13 26353742447280
14 728030940612638
15 21548668265211778
16 680330296613877761
17 22821706122361385354
18 810587673640374442445
19 30390159250481750866640

List of values

[1, 1, 5, 28, 225, 2206, 26174, 361278, 5704401, 101297701, 1998893240, 43386854622, 1027353587730, 26353742447280, 728030940612638, 21548668265211778, 680330296613877761, 22821706122361385354, 810587673640374442445, 30390159250481750866640]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.