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 | 1 |
| 1 | 5 |
| 2 | 24 |
| 3 | 115 |
| 4 | 551 |
| 5 | 2542 |
| 6 | 11193 |
| 7 | 46547 |
| 8 | 182164 |
| 9 | 670476 |
| 10 | 2325506 |
| 11 | 7624434 |
| 12 | 23716419 |
| 13 | 70253721 |
| 14 | 198905506 |
| 15 | 540079754 |
| 16 | 1410786483 |
| 17 | 3555443969 |
| 18 | 8667153126 |
| 19 | 20484365167 |
| 20 | 47037898503 |
| 21 | 105143200252 |
| 22 | 229178029000 |