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 | 19 |
| 2 | 84 |
| 3 | 115 |
| 4 | 242 |
| 5 | 690 |
| 6 | 1922 |
| 7 | 5460 |
| 8 | 15488 |
| 9 | 43792 |
| 10 | 124002 |
| 11 | 351154 |
| 12 | 994050 |
| 13 | 2814300 |
| 14 | 7968032 |
| 15 | 22558752 |
| 16 | 63867602 |
| 17 | 180820962 |
| 18 | 511936002 |
| 19 | 1449380900 |
| 20 | 4103455232 |
| 21 | 11617609120 |
| 22 | 32891508162 |
| 23 | 93121689570 |
| 24 | 263644006658 |
| 25 | 746422898732 |