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 | 7 |
| 3 | 18 |
| 4 | 50 |
| 5 | 118 |
| 6 | 301 |
| 7 | 684 |
| 8 | 1621 |
| 9 | 3620 |
| 10 | 8193 |
| 11 | 17846 |
| 12 | 39359 |
| 13 | 84198 |
| 14 | 181313 |
| 15 | 383208 |
| 16 | 811546 |
| 17 | 1695062 |
| 18 | 3546634 |
| 19 | 7341288 |
| 20 | 15207022 |
| 21 | 31261006 |
| 22 | 64255264 |
| 23 | 131317012 |
| 24 | 268336125 |
| 25 | 545858260 |
| 26 | 1110092387 |
| 27 | 2250057282 |
| 28 | 4558875555 |
| 29 | 9213251118 |
| 30 | 18613373708 |
| 31 | 37529713890 |