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 | 1 |
| 2 | 8 |
| 3 | 51 |
| 4 | 310 |
| 5 | 1865 |
| 6 | 11196 |
| 7 | 67183 |
| 8 | 403106 |
| 9 | 2418645 |
| 10 | 14511880 |
| 11 | 87071291 |
| 12 | 522427758 |
| 13 | 3134566561 |
| 14 | 18807399380 |
| 15 | 112844396295 |
| 16 | 677066377786 |
| 17 | 4062398266733 |
| 18 | 24374389600416 |
| 19 | 146246337602515 |
| 20 | 877478025615110 |
| 21 | 5264868153690681 |
| 22 | 31589208922144108 |
| 23 | 189535253532864671 |
| 24 | 1137211521197188050 |