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 | 4 |
| 3 | 10 |
| 4 | 39 |
| 5 | 131 |
| 6 | 521 |
| 7 | 1989 |
| 8 | 8149 |
| 9 | 33205 |
| 10 | 139870 |
| 11 | 592120 |
| 12 | 2552155 |
| 13 | 11079303 |
| 14 | 48639722 |
| 15 | 214997228 |
| 16 | 957817013 |
| 17 | 4292316197 |
| 18 | 19349957108 |
| 19 | 87663905954 |
| 20 | 399038606291 |
| 21 | 1823961268751 |
| 22 | 8369603968599 |
| 23 | 38540835938335 |
| 24 | 178056111047329 |
| 25 | 825079806039121 |
| 26 | 3833960405339446 |