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 | 7 |
| 2 | 36 |
| 3 | 157 |
| 4 | 625 |
| 5 | 2343 |
| 6 | 8427 |
| 7 | 29406 |
| 8 | 100296 |
| 9 | 336066 |
| 10 | 1110300 |
| 11 | 3626559 |
| 12 | 11734557 |
| 13 | 37673295 |
| 14 | 120150909 |
| 15 | 381040101 |
| 16 | 1202559732 |
| 17 | 3779328996 |
| 18 | 11833845967 |
| 19 | 36934571140 |
| 20 | 114947180946 |
| 21 | 356828242618 |
| 22 | 1105180433704 |