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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.

A242558 a(n) = Sum_{j=0..n} Sum_{i=0..j} L(i)*F(j) where L(i)=A000032(i) and F(j)=A000045(j).

Table of values

n a(n)
0 0
1 3
2 9
3 29
4 80
5 220
6 588
7 1563
8 4125
9 10857
10 28512
11 74792
12 196040
13 513619
14 1345281
15 3522981
16 9224880
17 24153636
18 63239220
19 165569195
20 433476725
21 1134874513
22 2971168704
23 7778667024
24 20364889680
25 53316094755
26 139583544633
27 365434781933

List of values

[0, 3, 9, 29, 80, 220, 588, 1563, 4125, 10857, 28512, 74792, 196040, 513619, 1345281, 3522981, 9224880, 24153636, 63239220, 165569195, 433476725, 1134874513, 2971168704, 7778667024, 20364889680, 53316094755, 139583544633, 365434781933]

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

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