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.

A340903 a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * sigma_0(k) * a(n-k).

Table of values

n a(n)
0 1
1 1
2 4
3 20
4 139
5 1192
6 12318
7 148318
8 2041754
9 31616757
10 544005172
11 10296204096
12 212589150300
13 4755177958104
14 114545293676588
15 2956316416222300
16 81386676426000157
17 2380590235918735576
18 73729207700492304684
19 2410324868012471929670
20 82944575892433740648996

List of values

[1, 1, 4, 20, 139, 1192, 12318, 148318, 2041754, 31616757, 544005172, 10296204096, 212589150300, 4755177958104, 114545293676588, 2956316416222300, 81386676426000157, 2380590235918735576, 73729207700492304684, 2410324868012471929670, 82944575892433740648996]

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

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