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 | 48 |
| 4 | 632 |
| 5 | 10130 |
| 6 | 194292 |
| 7 | 4730810 |
| 8 | 145114944 |
| 9 | 5529662802 |
| 10 | 256094790500 |
| 11 | 14038667879522 |
| 12 | 890349688082736 |
| 13 | 64160617557387338 |
| 14 | 5183023418382933060 |
| 15 | 464623151635449639450 |
| 16 | 45857185726197195813632 |
| 17 | 4951604249874284663582498 |
| 18 | 581839639424819461006405956 |