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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 7 |
| 7 | 12 |
| 8 | 35 |
| 9 | 87 |
| 10 | 348 |
| 11 | 1107 |
| 12 | 5518 |
| 13 | 22464 |
| 14 | 150574 |
| 15 | 817057 |
| 16 | 7118856 |
| 17 | 49644383 |
| 18 | 560434040 |
| 19 | 5142118400 |
| 20 | 76370120248 |
| 21 | 914476059335 |
| 22 | 17638655014128 |
| 23 | 274908897964359 |
| 24 | 6936239946318204 |
| 25 | 141510942505315328 |