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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.

A181411 a(n) = Sum_{k=0..n} C(n,k)*sigma(n+k) for n>=1.

Table of values

n a(n)
1 4
2 18
3 55
4 150
5 379
6 915
7 2146
8 4934
9 11080
10 24833
11 54476
12 119091
13 259432
14 556700
15 1195135
16 2561094
17 5428597
18 11488866
19 24350993
20 51296325
21 107427025
22 225330244
23 472762497
24 985966379
25 2049357779
26 4267962522
27 8887535983
28 18431783744

List of values

[4, 18, 55, 150, 379, 915, 2146, 4934, 11080, 24833, 54476, 119091, 259432, 556700, 1195135, 2561094, 5428597, 11488866, 24350993, 51296325, 107427025, 225330244, 472762497, 985966379, 2049357779, 4267962522, 8887535983, 18431783744]

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

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