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 | 0 |
| 1 | 3 |
| 2 | 10 |
| 3 | 31 |
| 4 | 112 |
| 5 | 503 |
| 6 | 2786 |
| 7 | 18443 |
| 8 | 141744 |
| 9 | 1237755 |
| 10 | 12088266 |
| 11 | 130457479 |
| 12 | 1541023936 |
| 13 | 19769882767 |
| 14 | 273671845058 |
| 15 | 4065274481939 |
| 16 | 64493941507232 |
| 17 | 1088226653465139 |
| 18 | 19458541429154250 |
| 19 | 367527663494842671 |
| 20 | 7311506648705326672 |
| 21 | 152804399672163086695 |
| 22 | 3347034732868985727202 |
| 23 | 76675452816691696778843 |