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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 30 |
| 6 | 76 |
| 7 | 196 |
| 8 | 512 |
| 9 | 1353 |
| 10 | 3610 |
| 11 | 9713 |
| 12 | 26324 |
| 13 | 71799 |
| 14 | 196938 |
| 15 | 542895 |
| 16 | 1503312 |
| 17 | 4179603 |
| 18 | 11662902 |
| 19 | 32652735 |
| 20 | 91695540 |
| 21 | 258215664 |
| 22 | 728997192 |
| 23 | 2062967382 |
| 24 | 5850674704 |
| 25 | 16626415975 |
| 26 | 47337954326 |
| 27 | 135015505407 |
| 28 | 385719506620 |
| 29 | 1103642686382 |
| 30 | 3162376205180 |
| 31 | 9073807670316 |
| 32 | 26068895429376 |