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 | 6 |
| 3 | 276 |
| 4 | 1891 |
| 5 | 88831 |
| 6 | 608856 |
| 7 | 28603266 |
| 8 | 196049701 |
| 9 | 9210162781 |
| 10 | 63127394826 |
| 11 | 2965643812176 |
| 12 | 20326825084231 |
| 13 | 954928097357851 |
| 14 | 6545174549727516 |
| 15 | 307483881705415806 |
| 16 | 2107525878187175881 |
| 17 | 99008854981046531641 |
| 18 | 678616787601720906126 |
| 19 | 31880543820015277772556 |