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 | 0 |
| 2 | 1 |
| 3 | 130 |
| 4 | 2446 |
| 5 | 21146 |
| 6 | 117971 |
| 7 | 494732 |
| 8 | 1695036 |
| 9 | 4992492 |
| 10 | 13072917 |
| 11 | 31153342 |
| 12 | 68720938 |
| 13 | 142120342 |
| 14 | 278268263 |
| 15 | 519829688 |
| 16 | 932250488 |
| 17 | 1613106744 |
| 18 | 2704301673 |
| 19 | 4407716634 |
| 20 | 7005003334 |
| 21 | 10882290034 |
| 22 | 16560665275 |
| 23 | 24733398404 |
| 24 | 36310956980 |
| 25 | 52474986980 |
| 26 | 74742532605 |
| 27 | 105041888406 |
| 28 | 145801597410 |
| 29 | 200054234926 |
| 30 | 271556748751 |
| 31 | 364929262576 |
| 32 | 485814390512 |