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) |
|---|---|
| 1 | 27 |
| 2 | 121 |
| 3 | 852 |
| 4 | 6443 |
| 5 | 52680 |
| 6 | 429976 |
| 7 | 3466702 |
| 8 | 27787183 |
| 9 | 222389326 |
| 10 | 1780673721 |
| 11 | 14267000759 |
| 12 | 114336941196 |
| 13 | 916296529103 |
| 14 | 7342802491841 |
| 15 | 58840508065211 |
| 16 | 471508681192630 |
| 17 | 3778370050644605 |
| 18 | 30277527214482376 |
| 19 | 242625604992194944 |