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 | 145 |
| 3 | 1752 |
| 4 | 21169 |
| 5 | 255780 |
| 6 | 3090529 |
| 7 | 37342128 |
| 8 | 451196065 |
| 9 | 5451694908 |
| 10 | 65871534961 |
| 11 | 795910114440 |
| 12 | 9616792908241 |
| 13 | 116197425013332 |
| 14 | 1403985893068225 |
| 15 | 16964028141832032 |
| 16 | 204972323595052609 |
| 17 | 2476631911282463340 |
| 18 | 29924555258984612689 |
| 19 | 361571295019097815608 |