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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.

A329969 a(n) = Sum_{k=1..n} Stirling2(n,k) * gcd(n,k).

Table of values

n a(n)
1 1
2 3
3 7
4 25
5 56
6 484
7 883
8 9643
9 32497
10 344277
11 678580
12 13364806
13 27644449
14 582379763
15 3257283507
16 28924878925
17 82864869820
18 2320283069804
19 5832742205075
20 159175049844787
21 1283043441049111
22 10423261367890565
23 44152005855084368
24 1678303577387465300
25 9478188244330160181

List of values

[1, 3, 7, 25, 56, 484, 883, 9643, 32497, 344277, 678580, 13364806, 27644449, 582379763, 3257283507, 28924878925, 82864869820, 2320283069804, 5832742205075, 159175049844787, 1283043441049111, 10423261367890565, 44152005855084368, 1678303577387465300, 9478188244330160181]

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

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