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 | 1 |
| 2 | 129 |
| 3 | 2316 |
| 4 | 26956 |
| 5 | 385017 |
| 6 | 5512443 |
| 7 | 70223666 |
| 8 | 866470849 |
| 9 | 10628564312 |
| 10 | 126832407040 |
| 11 | 1469751196093 |
| 12 | 16694372607012 |
| 13 | 186350644088784 |
| 14 | 2042610304126944 |
| 15 | 22007441766651756 |
| 16 | 233482509248479425 |
| 17 | 2441727926157182541 |
| 18 | 25187101530316996950 |
| 19 | 256456174925807404269 |