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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 46 |
| 6 | 211 |
| 7 | 1037 |
| 8 | 5377 |
| 9 | 29101 |
| 10 | 163120 |
| 11 | 941480 |
| 12 | 5570280 |
| 13 | 33664996 |
| 14 | 207249719 |
| 15 | 1296670793 |
| 16 | 8229378293 |
| 17 | 52895993341 |
| 18 | 343891293422 |
| 19 | 2258771535962 |
| 20 | 14974619271658 |
| 21 | 100117092310368 |
| 22 | 674548712552456 |
| 23 | 4577138309318008 |
| 24 | 31261253291922136 |
| 25 | 214800030086785976 |