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 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 37 |
| 7 | 93 |
| 8 | 354 |
| 9 | 1350 |
| 10 | 6351 |
| 11 | 31950 |
| 12 | 179307 |
| 13 | 1071265 |
| 14 | 6845581 |
| 15 | 46162583 |
| 16 | 327731950 |
| 17 | 2437753740 |
| 18 | 18948599220 |
| 19 | 153498350745 |
| 20 | 1293123243928 |
| 21 | 11306475314467 |
| 22 | 102425554299516 |
| 23 | 959826755336242 |
| 24 | 9290811905391501 |