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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 107 |
| 7 | 343 |
| 8 | 1184 |
| 9 | 4391 |
| 10 | 17448 |
| 11 | 74082 |
| 12 | 335131 |
| 13 | 1610301 |
| 14 | 8191728 |
| 15 | 43973853 |
| 16 | 248305235 |
| 17 | 1470474074 |
| 18 | 9107950029 |
| 19 | 58856529464 |
| 20 | 395914407606 |
| 21 | 2766669954699 |
| 22 | 20047716439541 |
| 23 | 150384068021507 |
| 24 | 1166037568730402 |
| 25 | 9332538119883810 |
| 26 | 77004693701288392 |
| 27 | 654279226353488820 |