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 | 2 |
| 3 | 7 |
| 4 | 36 |
| 5 | 173 |
| 6 | 806 |
| 7 | 3763 |
| 8 | 17608 |
| 9 | 82393 |
| 10 | 385482 |
| 11 | 1803487 |
| 12 | 8437740 |
| 13 | 39476613 |
| 14 | 184694254 |
| 15 | 864105611 |
| 16 | 4042781584 |
| 17 | 18914450865 |
| 18 | 88492648850 |
| 19 | 414019362743 |
| 20 | 1937020023220 |
| 21 | 9062490569821 |
| 22 | 42399528318646 |
| 23 | 198369310046307 |
| 24 | 928085399264344 |