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 | 1 |
| 2 | 14 |
| 3 | 211 |
| 4 | 3164 |
| 5 | 47461 |
| 6 | 711914 |
| 7 | 10678711 |
| 8 | 160180664 |
| 9 | 2402709961 |
| 10 | 36040649414 |
| 11 | 540609741211 |
| 12 | 8109146118164 |
| 13 | 121637191772461 |
| 14 | 1824557876586914 |
| 15 | 27368368148803711 |
| 16 | 410525522232055664 |
| 17 | 6157882833480834961 |
| 18 | 92368242502212524414 |
| 19 | 1385523637533187866211 |