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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 12 |
| 8 | 31 |
| 9 | 75 |
| 10 | 175 |
| 11 | 399 |
| 12 | 894 |
| 13 | 1975 |
| 14 | 4313 |
| 15 | 9330 |
| 16 | 20026 |
| 17 | 42704 |
| 18 | 90558 |
| 19 | 191117 |
| 20 | 401654 |
| 21 | 841016 |
| 22 | 1755249 |
| 23 | 3652663 |
| 24 | 7581369 |
| 25 | 15698735 |
| 26 | 32438224 |
| 27 | 66897295 |
| 28 | 137718495 |
| 29 | 283056086 |
| 30 | 580906268 |
| 31 | 1190538424 |
| 32 | 2436854280 |
| 33 | 4982012329 |
| 34 | 10174319500 |
| 35 | 20756971236 |
| 36 | 42306806495 |
| 37 | 86153127395 |