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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 7 |
| 5 | 223 |
| 6 | 2429 |
| 7 | 15045 |
| 8 | 66122 |
| 9 | 230074 |
| 10 | 675798 |
| 11 | 1745318 |
| 12 | 4073993 |
| 13 | 8764753 |
| 14 | 17630795 |
| 15 | 33522531 |
| 16 | 60756612 |
| 17 | 105666148 |
| 18 | 177293340 |
| 19 | 288246972 |
| 20 | 455749371 |
| 21 | 702898611 |
| 22 | 1060173961 |
| 23 | 1567213681 |
| 24 | 2274896558 |
| 25 | 3247759614 |
| 26 | 4566786770 |
| 27 | 6332604226 |
| 28 | 8669120733 |
| 29 | 11727651845 |