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 | 7 |
| 3 | 55 |
| 4 | 455 |
| 5 | 3876 |
| 6 | 33649 |
| 7 | 296010 |
| 8 | 2629575 |
| 9 | 23535820 |
| 10 | 211915132 |
| 11 | 1917334783 |
| 12 | 17417133617 |
| 13 | 158753389900 |
| 14 | 1451182990950 |
| 15 | 13298522298180 |
| 16 | 122131734269895 |
| 17 | 1123787895356412 |
| 18 | 10358022441395860 |
| 19 | 95615237915961100 |
| 20 | 883829035553043580 |
| 21 | 8179808679272664720 |
| 22 | 75788358475481302185 |