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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.

A383436 a(1) = 1; a(n) = 2 + n * Sum_{k=1..n-1} a(k).

Table of values

n a(n)
1 1
2 4
3 17
4 90
5 562
6 4046
7 33042
8 302098
9 3058742
10 33986022
11 411230866
12 5383385882
13 75816017838
14 1143072268942
15 18370804322282
16 313528393766946
17 5663106612415462
18 107932149554271158
19 2164639221616216002
20 45571352034025600042
21 1004848312350264480926
22 23159361103691809941342

List of values

[1, 4, 17, 90, 562, 4046, 33042, 302098, 3058742, 33986022, 411230866, 5383385882, 75816017838, 1143072268942, 18370804322282, 313528393766946, 5663106612415462, 107932149554271158, 2164639221616216002, 45571352034025600042, 1004848312350264480926, 23159361103691809941342]

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

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