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 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 152 |
| 5 | 690 |
| 6 | 3422 |
| 7 | 18257 |
| 8 | 103144 |
| 9 | 608730 |
| 10 | 3713524 |
| 11 | 23235490 |
| 12 | 148281656 |
| 13 | 961255200 |
| 14 | 6311395814 |
| 15 | 41878914665 |
| 16 | 280365966232 |
| 17 | 1891270498050 |
| 18 | 12842102343820 |
| 19 | 87703053156406 |
| 20 | 601999871121200 |
| 21 | 4150859861430252 |
| 22 | 28736613316786220 |
| 23 | 199671324115916570 |