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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.

A014938 a(1)=1, a(n) = n*21^(n-1) + a(n-1).

Table of values

n a(n)
1 1
2 43
3 1366
4 38410
5 1010815
6 25515421
7 625878268
8 15034586596
9 355440320845
10 8298240786655
11 191776931546866
12 4395106938053518
13 100020864586079851
14 2262634152933752305
15 50921433140756382520
16 1140878530467983299336
17 25460546264581733880793
18 566215511176052187986131

List of values

[1, 43, 1366, 38410, 1010815, 25515421, 625878268, 15034586596, 355440320845, 8298240786655, 191776931546866, 4395106938053518, 100020864586079851, 2262634152933752305, 50921433140756382520, 1140878530467983299336, 25460546264581733880793, 566215511176052187986131]

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

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