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 | 15 |
| 4 | 675 |
| 5 | 7915 |
| 6 | 41310 |
| 7 | 145383 |
| 8 | 404185 |
| 9 | 959115 |
| 10 | 2029980 |
| 11 | 3939295 |
| 12 | 7139823 |
| 13 | 12245355 |
| 14 | 20064730 |
| 15 | 31639095 |
| 16 | 48282405 |
| 17 | 71625163 |
| 18 | 103661400 |
| 19 | 146798895 |
| 20 | 203912635 |
| 21 | 278401515 |
| 22 | 374248278 |
| 23 | 496082695 |
| 24 | 649247985 |
| 25 | 839870475 |
| 26 | 1074932500 |
| 27 | 1362348543 |
| 28 | 1711044615 |