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 | 2 |
| 2 | 14 |
| 3 | 36 |
| 4 | 214 |
| 5 | 604 |
| 6 | 3340 |
| 7 | 9928 |
| 8 | 52582 |
| 9 | 161708 |
| 10 | 831588 |
| 11 | 2620920 |
| 12 | 13187836 |
| 13 | 42350744 |
| 14 | 209519576 |
| 15 | 682960784 |
| 16 | 3332923526 |
| 17 | 10998087884 |
| 18 | 53067486836 |
| 19 | 176924683544 |
| 20 | 845545262996 |
| 21 | 2843923177544 |
| 22 | 13479791673896 |
| 23 | 45685735967984 |