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 | 3 |
| 3 | 15 |
| 4 | 104 |
| 5 | 495 |
| 6 | 975 |
| 7 | 22935 |
| 8 | 32864 |
| 9 | 57584 |
| 10 | 131144 |
| 11 | 491535 |
| 12 | 2539004 |
| 13 | 3988424 |
| 14 | 6235215 |
| 15 | 7378371 |
| 16 | 13258575 |
| 17 | 17949434 |
| 18 | 25637744 |
| 19 | 26879684 |
| 20 | 29357475 |
| 21 | 32235735 |
| 22 | 41246864 |
| 23 | 48615735 |
| 24 | 184611375 |
| 25 | 229944855 |
| 26 | 257278724 |
| 27 | 290849624 |
| 28 | 429461864 |
| 29 | 550666515 |
| 30 | 671054835 |
| 31 | 706075095 |