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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 2259 |
| 10 | 2835075 |
| 11 | 2609269245 |
| 12 | 1964842113102 |
| 13 | 1282310235724518 |
| 14 | 751046094737039530 |
| 15 | 403981152738311915910 |
| 16 | 202813559477327441603103 |
| 17 | 96164301413883629093787477 |
| 18 | 43451168714121294538702462965 |
| 19 | 18840049876438047870808567312395 |