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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 22 |
| 7 | 56 |
| 8 | 136 |
| 9 | 348 |
| 10 | 890 |
| 11 | 2332 |
| 12 | 6136 |
| 13 | 16380 |
| 14 | 43988 |
| 15 | 119170 |
| 16 | 324720 |
| 17 | 890290 |
| 18 | 2452752 |
| 19 | 6789308 |
| 20 | 18868520 |
| 21 | 52635730 |
| 22 | 147323176 |
| 23 | 413618614 |
| 24 | 1164510896 |
| 25 | 3287073450 |
| 26 | 9300500508 |
| 27 | 26372968632 |
| 28 | 74937133488 |
| 29 | 213333642442 |
| 30 | 608400799010 |
| 31 | 1737954608280 |