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 | 43 |
| 3 | 316 |
| 4 | 2563 |
| 5 | 17284 |
| 6 | 135843 |
| 7 | 903141 |
| 8 | 6153645 |
| 9 | 39839122 |
| 10 | 256023118 |
| 11 | 1589382754 |
| 12 | 9751548710 |
| 13 | 58451287319 |
| 14 | 345478493273 |
| 15 | 2006641555356 |
| 16 | 11498560570683 |
| 17 | 64940715401160 |
| 18 | 362249937059777 |
| 19 | 1995639600211016 |
| 20 | 10870475203155005 |
| 21 | 58563229198239242 |
| 22 | 312277069694594537 |