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 | 5 |
| 3 | 9 |
| 4 | 44 |
| 5 | 123 |
| 6 | 986 |
| 7 | 5043 |
| 8 | 45832 |
| 9 | 366300 |
| 10 | 3862429 |
| 11 | 39916803 |
| 12 | 495023832 |
| 13 | 6227020803 |
| 14 | 88549595295 |
| 15 | 1308012377572 |
| 16 | 21086922542349 |
| 17 | 355687428096003 |
| 18 | 6427700493998229 |
| 19 | 121645100408832003 |
| 20 | 2437658338007783347 |
| 21 | 51091307195905020227 |
| 22 | 1125098837523651728389 |
| 23 | 25852016738884976640003 |
| 24 | 620752163206546966698620 |
| 25 | 15511210044577707492319496 |