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 | 2 |
| 2 | 13 |
| 3 | 87 |
| 4 | 631 |
| 5 | 4884 |
| 6 | 39876 |
| 7 | 336756 |
| 8 | 2914140 |
| 9 | 25683614 |
| 10 | 229595323 |
| 11 | 2075911061 |
| 12 | 18944394204 |
| 13 | 174219183788 |
| 14 | 1612626081244 |
| 15 | 15010195375589 |
| 16 | 140387627837380 |
| 17 | 1318553324421089 |
| 18 | 12430152478650578 |
| 19 | 117566893367826528 |
| 20 | 1115249538463126642 |
| 21 | 10607400237283187171 |
| 22 | 101131327003506262770 |
| 23 | 966289700136857769743 |