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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 29 |
| 6 | 98 |
| 7 | 372 |
| 8 | 1538 |
| 9 | 6755 |
| 10 | 30996 |
| 11 | 146982 |
| 12 | 715120 |
| 13 | 3552254 |
| 14 | 17951322 |
| 15 | 92045058 |
| 16 | 477882876 |
| 17 | 2508122859 |
| 18 | 13289437362 |
| 19 | 71010166670 |
| 20 | 382291606570 |
| 21 | 2072025828101 |
| 22 | 11298920776704 |
| 23 | 61954857579594 |
| 24 | 341427364138880 |