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.
| n | a(n) |
|---|---|
| 0 | 10 |
| 1 | 21 |
| 2 | 430 |
| 3 | 881 |
| 4 | 18050 |
| 5 | 36981 |
| 6 | 757670 |
| 7 | 1552321 |
| 8 | 31804090 |
| 9 | 65160501 |
| 10 | 1335014110 |
| 11 | 2735188721 |
| 12 | 56038788530 |
| 13 | 114812765781 |
| 14 | 2352294104150 |
| 15 | 4819400974081 |
| 16 | 98740313585770 |
| 17 | 202300028145621 |
| 18 | 4144740876498190 |
| 19 | 8491781781142001 |
| 20 | 173980376499338210 |
| 21 | 356452534779818421 |