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 | 1 |
| 2 | 13 |
| 3 | 83 |
| 4 | 1103 |
| 5 | 11453 |
| 6 | 127320 |
| 7 | 1388914 |
| 8 | 15330926 |
| 9 | 167842605 |
| 10 | 1845273115 |
| 11 | 20252779428 |
| 12 | 222470481108 |
| 13 | 2442643290488 |
| 14 | 26825729083460 |
| 15 | 294573090471640 |
| 16 | 3234887436123961 |
| 17 | 35523266398630041 |
| 18 | 390097222479871444 |
| 19 | 4283805079495347243 |
| 20 | 47042252237178793997 |