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 | 7 |
| 3 | 40 |
| 4 | 172 |
| 5 | 607 |
| 6 | 2073 |
| 7 | 7414 |
| 8 | 26070 |
| 9 | 84099 |
| 10 | 243529 |
| 11 | 636130 |
| 12 | 1518166 |
| 13 | 3354325 |
| 14 | 6940831 |
| 15 | 13579716 |
| 16 | 25318372 |
| 17 | 45270813 |
| 18 | 78039555 |
| 19 | 130259668 |
| 20 | 211289368 |
| 21 | 334074499 |
| 22 | 516217405 |
| 23 | 781284010 |
| 24 | 1160386410 |
| 25 | 1694081935 |
| 26 | 2434633461 |
| 27 | 3448679742 |
| 28 | 4820368690 |
| 29 | 6655010857 |