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 | 8 |
| 2 | 33 |
| 3 | 140 |
| 4 | 593 |
| 5 | 2512 |
| 6 | 10641 |
| 7 | 45076 |
| 8 | 190945 |
| 9 | 808856 |
| 10 | 3426369 |
| 11 | 14514332 |
| 12 | 61483697 |
| 13 | 260449120 |
| 14 | 1103280177 |
| 15 | 4673569828 |
| 16 | 19797559489 |
| 17 | 83863807784 |
| 18 | 355252790625 |
| 19 | 1504874970284 |
| 20 | 6374752671761 |