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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 18 |
| 5 | 95 |
| 6 | 440 |
| 7 | 1897 |
| 8 | 7882 |
| 9 | 32139 |
| 10 | 129804 |
| 11 | 521741 |
| 12 | 2092046 |
| 13 | 8378383 |
| 14 | 33533968 |
| 15 | 134176785 |
| 16 | 536789010 |
| 17 | 2147319827 |
| 18 | 8589606932 |
| 19 | 34359083029 |
| 20 | 137437642774 |
| 21 | 549753192471 |
| 22 | 2199018012696 |
| 23 | 8796082536473 |
| 24 | 35184351117338 |
| 25 | 140737446412315 |
| 26 | 562949869535260 |