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) |
|---|---|
| 0 | 1 |
| 1 | 110 |
| 2 | 3080 |
| 3 | 40370 |
| 4 | 322190 |
| 5 | 1815506 |
| 6 | 7925720 |
| 7 | 28512110 |
| 8 | 88206140 |
| 9 | 241925530 |
| 10 | 601585512 |
| 11 | 1379301990 |
| 12 | 2953859370 |
| 13 | 5968878630 |
| 14 | 11472968760 |
| 15 | 21114177018 |
| 16 | 37403270520 |
| 17 | 64062783510 |
| 18 | 106481351240 |
| 19 | 172295622730 |
| 20 | 272125000774 |
| 21 | 420487598410 |