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 | 12 |
| 2 | 243 |
| 3 | 3994 |
| 4 | 58565 |
| 5 | 805256 |
| 6 | 10629367 |
| 7 | 136410198 |
| 8 | 1714871049 |
| 9 | 21221529220 |
| 10 | 259374246011 |
| 11 | 3138428376722 |
| 12 | 37661140520653 |
| 13 | 448795257871104 |
| 14 | 5316497670165375 |
| 15 | 62658722541234766 |
| 16 | 735195677817154577 |
| 17 | 8592599484487994108 |
| 18 | 100078511642860166659 |
| 19 | 1162022718519876379530 |