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 | 3 |
| 2 | 13 |
| 3 | 94 |
| 4 | 810 |
| 5 | 7667 |
| 6 | 76998 |
| 7 | 805560 |
| 8 | 8684533 |
| 9 | 95800850 |
| 10 | 1076159466 |
| 11 | 12268026894 |
| 12 | 141565916433 |
| 13 | 1650395185407 |
| 14 | 19409211522550 |
| 15 | 229984643863260 |
| 16 | 2743097412254490 |
| 17 | 32907239462485422 |
| 18 | 396793477697214450 |
| 19 | 4806417317271974580 |
| 20 | 58460150525944945840 |
| 21 | 713685698665966837135 |
| 22 | 8742060290902752902340 |