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 | 257 |
| 3 | 6818 |
| 4 | 72354 |
| 5 | 462979 |
| 6 | 2142595 |
| 7 | 7907396 |
| 8 | 24684612 |
| 9 | 67731333 |
| 10 | 167731333 |
| 11 | 382090214 |
| 12 | 812071910 |
| 13 | 1627802631 |
| 14 | 3103591687 |
| 15 | 5666482312 |
| 16 | 9961449608 |
| 17 | 16937207049 |
| 18 | 27957167625 |
| 19 | 44940730666 |
| 20 | 70540730666 |
| 21 | 108363590027 |
| 22 | 163239463563 |
| 23 | 241550448844 |