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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.

A301971 a(n) = [x^n] Product_{k>=1} 1/(1 - x^prime(k))^n.

Table of values

n a(n)
0 1
1 0
2 2
3 3
4 10
5 30
6 77
7 252
8 682
9 2136
10 6182
11 18766
12 56173
13 169351
14 512990
15 1551828
16 4720170
17 14348289
18 43751984
19 133502873
20 408029510
21 1248460587
22 3823949824
23 11724787763
24 35980251181
25 110510334780
26 339674840715
27 1044812449722
28 3215861978150
29 9904301974294
30 30521063942312
31 94103983534015

List of values

[1, 0, 2, 3, 10, 30, 77, 252, 682, 2136, 6182, 18766, 56173, 169351, 512990, 1551828, 4720170, 14348289, 43751984, 133502873, 408029510, 1248460587, 3823949824, 11724787763, 35980251181, 110510334780, 339674840715, 1044812449722, 3215861978150, 9904301974294, 30521063942312, 94103983534015]

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

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