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 | 67 |
| 3 | 694 |
| 4 | 7459 |
| 5 | 81922 |
| 6 | 912718 |
| 7 | 10273228 |
| 8 | 116522275 |
| 9 | 1329569290 |
| 10 | 15244087642 |
| 11 | 175472098996 |
| 12 | 2026521318286 |
| 13 | 23470106563924 |
| 14 | 272476942589884 |
| 15 | 3169997065488664 |
| 16 | 36948020548661539 |
| 17 | 431354994430077274 |
| 18 | 5043279137171450914 |
| 19 | 59041965004582271524 |
| 20 | 692026745415822877594 |
| 21 | 8119918150063503715324 |