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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 44 |
| 5 | 134 |
| 6 | 404 |
| 7 | 1212 |
| 8 | 3638 |
| 9 | 10915 |
| 10 | 32746 |
| 11 | 98239 |
| 12 | 294717 |
| 13 | 884153 |
| 14 | 2652459 |
| 15 | 7957379 |
| 16 | 23872137 |
| 17 | 71616412 |
| 18 | 214849236 |
| 19 | 644547710 |
| 20 | 1933643132 |
| 21 | 5800929396 |
| 22 | 17402788190 |
| 23 | 52208364570 |
| 24 | 156625093712 |
| 25 | 469875281138 |
| 26 | 1409625843415 |
| 27 | 4228877530246 |
| 28 | 12686632590738 |
| 29 | 38059897772216 |