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 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 36 |
| 5 | 72 |
| 6 | 220 |
| 7 | 936 |
| 8 | 4045 |
| 9 | 15836 |
| 10 | 56174 |
| 11 | 187148 |
| 12 | 616651 |
| 13 | 2114448 |
| 14 | 7717752 |
| 15 | 29498000 |
| 16 | 114243269 |
| 17 | 437915876 |
| 18 | 1650264874 |
| 19 | 6149423732 |
| 20 | 22909545269 |
| 21 | 86129798600 |
| 22 | 327872238092 |
| 23 | 1260466647944 |
| 24 | 4867739842821 |
| 25 | 18801022899756 |
| 26 | 72501445905366 |