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 | 11 |
| 2 | 77 |
| 3 | 440 |
| 4 | 2167 |
| 5 | 9592 |
| 6 | 39127 |
| 7 | 149237 |
| 8 | 538329 |
| 9 | 1851674 |
| 10 | 6111171 |
| 11 | 19448573 |
| 12 | 59922709 |
| 13 | 179331603 |
| 14 | 522723740 |
| 15 | 1487454914 |
| 16 | 4140279660 |
| 17 | 11292030255 |
| 18 | 30221623905 |
| 19 | 79475723767 |
| 20 | 205600559461 |
| 21 | 523762010695 |
| 22 | 1315113742769 |
| 23 | 3257405396388 |
| 24 | 7964974336693 |
| 25 | 19239590761567 |