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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.

A343523 a(0) = 1; a(n) = 2 * Sum_{k=1..n} binomial(n,k) * a(k-1).

Table of values

n a(n)
0 1
1 2
2 8
3 34
4 164
5 878
6 5136
7 32490
8 220476
9 1594470
10 12223016
11 98876322
12 840804820
13 7491247006
14 69730182720
15 676390547034
16 6821988655468
17 71398971351510
18 774032400213336
19 8677733804696594
20 100459693769214980
21 1199306075189097230
22 14746332963835756400
23 186534818943430728906

List of values

[1, 2, 8, 34, 164, 878, 5136, 32490, 220476, 1594470, 12223016, 98876322, 840804820, 7491247006, 69730182720, 676390547034, 6821988655468, 71398971351510, 774032400213336, 8677733804696594, 100459693769214980, 1199306075189097230, 14746332963835756400, 186534818943430728906]

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

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