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 | 2 |
| 2 | 13 |
| 3 | 15 |
| 4 | 58 |
| 5 | 305 |
| 6 | 1278 |
| 7 | 28421 |
| 8 | 29699 |
| 9 | 58120 |
| 10 | 262179 |
| 11 | 320299 |
| 12 | 902777 |
| 13 | 76153567 |
| 14 | 77056344 |
| 15 | 307322599 |
| 16 | 384378943 |
| 17 | 2613596257 |
| 18 | 2997975200 |
| 19 | 11607521857 |
| 20 | 14605497057 |
| 21 | 143056995370 |
| 22 | 157662492427 |
| 23 | 300719487797 |
| 24 | 458381980224 |
| 25 | 759101468021 |
| 26 | 14881309872623 |