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) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 93 |
| 4 | 453 |
| 5 | 2050 |
| 6 | 9516 |
| 7 | 44129 |
| 8 | 204780 |
| 9 | 950346 |
| 10 | 4410194 |
| 11 | 20465923 |
| 12 | 94974721 |
| 13 | 440743516 |
| 14 | 2045330613 |
| 15 | 9491634200 |
| 16 | 44047218242 |
| 17 | 204407115009 |
| 18 | 948579057090 |
| 19 | 4402010267626 |
| 20 | 20428127976053 |
| 21 | 94799509246526 |
| 22 | 439930030199648 |