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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 3 |
| 9 | 9 |
| 10 | 23 |
| 11 | 67 |
| 12 | 203 |
| 13 | 693 |
| 14 | 2584 |
| 15 | 9929 |
| 16 | 37480 |
| 17 | 137067 |
| 18 | 522854 |
| 19 | 2052657 |
| 20 | 8199728 |
| 21 | 33456333 |
| 22 | 137831268 |
| 23 | 574295984 |
| 24 | 2392149818 |
| 25 | 9950364020 |
| 26 | 41860671346 |
| 27 | 177512155194 |
| 28 | 757447761138 |
| 29 | 3254519322231 |
| 30 | 14049972380612 |
| 31 | 60960849334377 |
| 32 | 265354255338637 |