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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 26 |
| 6 | 68 |
| 7 | 176 |
| 8 | 454 |
| 9 | 1174 |
| 10 | 3052 |
| 11 | 7976 |
| 12 | 20932 |
| 13 | 55108 |
| 14 | 145448 |
| 15 | 384704 |
| 16 | 1019462 |
| 17 | 2706214 |
| 18 | 7194956 |
| 19 | 19155896 |
| 20 | 51065260 |
| 21 | 136284236 |
| 22 | 364097912 |
| 23 | 973654240 |
| 24 | 2605983772 |
| 25 | 6980545276 |
| 26 | 18712478072 |
| 27 | 50196568144 |
| 28 | 134739960904 |
| 29 | 361892443592 |
| 30 | 972537193168 |