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 | 4 |
| 3 | 17 |
| 4 | 64 |
| 5 | 233 |
| 6 | 820 |
| 7 | 2825 |
| 8 | 9568 |
| 9 | 31985 |
| 10 | 105796 |
| 11 | 346913 |
| 12 | 1129312 |
| 13 | 3653657 |
| 14 | 11758132 |
| 15 | 37665881 |
| 16 | 120172096 |
| 17 | 382039649 |
| 18 | 1210689028 |
| 19 | 3825777329 |
| 20 | 12058462720 |
| 21 | 37918780361 |
| 22 | 118986517684 |
| 23 | 372650082857 |
| 24 | 1165021837984 |