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 | 11 |
| 3 | 95 |
| 4 | 781 |
| 5 | 6336 |
| 6 | 51205 |
| 7 | 413351 |
| 8 | 3335651 |
| 9 | 26915305 |
| 10 | 217172736 |
| 11 | 1752296281 |
| 12 | 14138673395 |
| 13 | 114079985111 |
| 14 | 920471087701 |
| 15 | 7426955448000 |
| 16 | 59925473898301 |
| 17 | 483517428660911 |
| 18 | 3901330906652795 |
| 19 | 31478457514091281 |
| 20 | 253988526230055936 |