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 | 8 |
| 2 | 59 |
| 3 | 437 |
| 4 | 3236 |
| 5 | 23963 |
| 6 | 177449 |
| 7 | 1314032 |
| 8 | 9730571 |
| 9 | 72056093 |
| 10 | 533584364 |
| 11 | 3951258827 |
| 12 | 29259564881 |
| 13 | 216670730648 |
| 14 | 1604473809179 |
| 15 | 11881328856197 |
| 16 | 87982723420916 |
| 17 | 651523050515003 |
| 18 | 4824609523867769 |
| 19 | 35726835818619392 |
| 20 | 264561679301939051 |
| 21 | 1959112262569431533 |