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 | 0 |
| 1 | 1 |
| 2 | 11 |
| 3 | 91 |
| 4 | 46 |
| 5 | 1526 |
| 6 | 15406 |
| 7 | 45561 |
| 8 | 117116 |
| 9 | 312071 |
| 10 | 1872426 |
| 11 | 21000181 |
| 12 | 223657336 |
| 13 | 853662766 |
| 14 | 5121976596 |
| 15 | 12421312701 |
| 16 | 74527876206 |
| 17 | 141991475986 |
| 18 | 2377827762166 |
| 19 | 18081663838621 |
| 20 | 32196037719226 |
| 21 | 2441363034106 |
| 22 | 491485336407761 |
| 23 | 2948912018446566 |