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 | 10 |
| 2 | 92 |
| 3 | 738 |
| 4 | 5053 |
| 5 | 29930 |
| 6 | 155904 |
| 7 | 725560 |
| 8 | 3061223 |
| 9 | 11854073 |
| 10 | 42564874 |
| 11 | 142944110 |
| 12 | 452197071 |
| 13 | 1355697097 |
| 14 | 3871729568 |
| 15 | 10579613832 |
| 16 | 27765888553 |
| 17 | 70221521921 |
| 18 | 171635652958 |
| 19 | 406476831574 |
| 20 | 934849110107 |
| 21 | 2092203571359 |