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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.

A371487 Expansion of e.g.f. Product_{k>=2} 1 / (1 - x^k/k).

Table of values

n a(n)
0 1
1 0
2 1
3 2
4 12
5 44
6 380
7 2064
8 20888
9 166368
10 1872792
11 18917040
12 253473792
13 3042859104
14 45895372224
15 661334985024
16 11073993828480
17 182021308975104
18 3418263102400128
19 63023443312105728
20 1302276954815368704
21 26806365139264980480
22 603186053115872024064
23 13651035149069305878528

List of values

[1, 0, 1, 2, 12, 44, 380, 2064, 20888, 166368, 1872792, 18917040, 253473792, 3042859104, 45895372224, 661334985024, 11073993828480, 182021308975104, 3418263102400128, 63023443312105728, 1302276954815368704, 26806365139264980480, 603186053115872024064, 13651035149069305878528]

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

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