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 | 15 |
| 4 | 32 |
| 5 | 239 |
| 6 | 510 |
| 7 | 3809 |
| 8 | 8128 |
| 9 | 60705 |
| 10 | 129538 |
| 11 | 967471 |
| 12 | 2064480 |
| 13 | 15418831 |
| 14 | 32902142 |
| 15 | 245733825 |
| 16 | 524369792 |
| 17 | 3916322369 |
| 18 | 8357014530 |
| 19 | 62415424079 |
| 20 | 133187862688 |
| 21 | 994730462895 |
| 22 | 2122648788478 |
| 23 | 15853271982241 |
| 24 | 33829192752960 |
| 25 | 252657621252961 |
| 26 | 539144435258882 |