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 | 6 |
| 3 | 35 |
| 4 | 188 |
| 5 | 989 |
| 6 | 5131 |
| 7 | 26411 |
| 8 | 135229 |
| 9 | 689814 |
| 10 | 3509014 |
| 11 | 17811637 |
| 12 | 90256685 |
| 13 | 456719880 |
| 14 | 2308440442 |
| 15 | 11656409995 |
| 16 | 58809893357 |
| 17 | 296500180806 |
| 18 | 1493924791698 |
| 19 | 7523064390774 |
| 20 | 37866103978109 |
| 21 | 190510720248534 |
| 22 | 958122016323881 |
| 23 | 4816944544836927 |
| 24 | 24209532464417585 |