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 | 2 |
| 3 | 6 |
| 4 | 14 |
| 5 | 40 |
| 6 | 102 |
| 7 | 284 |
| 8 | 752 |
| 9 | 2069 |
| 10 | 5547 |
| 11 | 15134 |
| 12 | 40712 |
| 13 | 110456 |
| 14 | 297066 |
| 15 | 802808 |
| 16 | 2156378 |
| 17 | 5810329 |
| 18 | 15584271 |
| 19 | 41894990 |
| 20 | 112217372 |
| 21 | 301115391 |
| 22 | 805584175 |
| 23 | 2158366236 |
| 24 | 5768337730 |
| 25 | 15435275815 |
| 26 | 41214200699 |
| 27 | 110164972820 |
| 28 | 293922598172 |
| 29 | 784925297952 |
| 30 | 2092745480990 |
| 31 | 5584229143243 |