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 | 6 |
| 2 | 39 |
| 3 | 248 |
| 4 | 1559 |
| 5 | 9793 |
| 6 | 61529 |
| 7 | 386598 |
| 8 | 2429064 |
| 9 | 15262259 |
| 10 | 95895601 |
| 11 | 602529829 |
| 12 | 3785806568 |
| 13 | 23786924201 |
| 14 | 149457652642 |
| 15 | 939070127125 |
| 16 | 5900351625162 |
| 17 | 37073002638414 |
| 18 | 232936545470713 |
| 19 | 1463583480006755 |
| 20 | 9195966217409213 |
| 21 | 57779959822545404 |
| 22 | 363042194606444109 |
| 23 | 2281061383037441740 |