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 | 2 |
| 2 | 11 |
| 3 | 41 |
| 4 | 129 |
| 5 | 376 |
| 6 | 1048 |
| 7 | 2850 |
| 8 | 7635 |
| 9 | 20273 |
| 10 | 53537 |
| 11 | 140912 |
| 12 | 370128 |
| 13 | 970978 |
| 14 | 2545243 |
| 15 | 6668697 |
| 16 | 17467233 |
| 17 | 45743336 |
| 18 | 119779496 |
| 19 | 313622210 |
| 20 | 821130915 |
| 21 | 2149841377 |
| 22 | 5628507841 |
| 23 | 14735867616 |
| 24 | 38579395104 |
| 25 | 101002803266 |
| 26 | 264429800363 |