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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.

A371389 Expansion of e.g.f. Product_{k>=1} (1 + x^k/k)^2.

Table of values

n a(n)
0 1
1 2
2 4
3 16
4 74
5 388
6 2756
7 20872
8 180008
9 1758672
10 18937152
11 221914944
12 2832193008
13 39039810912
14 575502635808
15 9100950684480
16 152818028328960
17 2717564023296000
18 51129136369981440
19 1012979833297735680
20 21074454817487953920
21 460035753479203184640

List of values

[1, 2, 4, 16, 74, 388, 2756, 20872, 180008, 1758672, 18937152, 221914944, 2832193008, 39039810912, 575502635808, 9100950684480, 152818028328960, 2717564023296000, 51129136369981440, 1012979833297735680, 21074454817487953920, 460035753479203184640]

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

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