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 | 123 |
| 2 | 3281 |
| 3 | 39175 |
| 4 | 286555 |
| 5 | 1508401 |
| 6 | 6271378 |
| 7 | 21836366 |
| 8 | 66220705 |
| 9 | 179784715 |
| 10 | 445824731 |
| 11 | 1025102013 |
| 12 | 2211041131 |
| 13 | 4514532465 |
| 14 | 8789910980 |
| 15 | 16416797116 |
| 16 | 29556115153 |
| 17 | 51502789451 |
| 18 | 87162399205 |
| 19 | 143684487475 |
| 20 | 231291309931 |
| 21 | 364347612673 |
| 22 | 562724586326 |