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 | 14 |
| 2 | 160 |
| 3 | 1770 |
| 4 | 19485 |
| 5 | 214356 |
| 6 | 2357944 |
| 7 | 25937420 |
| 8 | 285311665 |
| 9 | 3138428370 |
| 10 | 34522712136 |
| 11 | 379749833574 |
| 12 | 4177248169405 |
| 13 | 45949729863560 |
| 14 | 505447028499280 |
| 15 | 5559917313492216 |
| 16 | 61159090448414529 |
| 17 | 672749994932559990 |
| 18 | 7400249944258160080 |
| 19 | 81402749386839761090 |