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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.

A356038 a(n) = Sum_{k=1..n} binomial(n,k) * sigma_2(k).

Table of values

n a(n)
1 1
2 7
3 28
4 95
5 286
6 802
7 2143
8 5519
9 13807
10 33762
11 81060
12 191678
13 447396
14 1032647
15 2360593
16 5351231
17 12041764
18 26920297
19 59829006
20 132262550
21 290990077
22 637429514
23 1390811841
24 3023647046
25 6551547161
26 14151910442
27 30481920523
28 65480947739
29 140318385088
30 299995596747

List of values

[1, 7, 28, 95, 286, 802, 2143, 5519, 13807, 33762, 81060, 191678, 447396, 1032647, 2360593, 5351231, 12041764, 26920297, 59829006, 132262550, 290990077, 637429514, 1390811841, 3023647046, 6551547161, 14151910442, 30481920523, 65480947739, 140318385088, 299995596747]

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

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