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 | 7 |
| 3 | 17 |
| 4 | 203 |
| 5 | 455 |
| 6 | 2723 |
| 7 | 6001 |
| 8 | 133107 |
| 9 | 312011 |
| 10 | 1613529 |
| 11 | 3705303 |
| 12 | 39159519 |
| 13 | 88466147 |
| 14 | 443939867 |
| 15 | 1041952049 |
| 16 | 40842931395 |
| 17 | 93889422323 |
| 18 | 460998957853 |
| 19 | 1054706036923 |
| 20 | 10194929714949 |
| 21 | 23513104814105 |
| 22 | 111438617932133 |
| 23 | 255719229005751 |
| 24 | 4864448363248503 |