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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 5 |
| 7 | 35 |
| 8 | 140 |
| 9 | 420 |
| 10 | 1050 |
| 11 | 2310 |
| 12 | 4620 |
| 13 | 8580 |
| 14 | 15015 |
| 15 | 25025 |
| 16 | 40040 |
| 17 | 61880 |
| 18 | 92820 |
| 19 | 135660 |
| 20 | 193800 |
| 21 | 271320 |
| 22 | 373065 |
| 23 | 504735 |
| 24 | 672980 |
| 25 | 885500 |
| 26 | 1151150 |
| 27 | 1480050 |
| 28 | 1883700 |
| 29 | 2375100 |
| 30 | 2968875 |
| 31 | 3681405 |
| 32 | 4530960 |
| 33 | 5537840 |
| 34 | 6724520 |
| 35 | 8115800 |
| 36 | 9738960 |
| 37 | 11623920 |
| 38 | 13803405 |