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 | 2 |
| 5 | 10 |
| 6 | 30 |
| 7 | 70 |
| 8 | 140 |
| 9 | 252 |
| 10 | 420 |
| 11 | 660 |
| 12 | 990 |
| 13 | 1430 |
| 14 | 2002 |
| 15 | 2730 |
| 16 | 3640 |
| 17 | 4760 |
| 18 | 6120 |
| 19 | 7752 |
| 20 | 9690 |
| 21 | 11970 |
| 22 | 14630 |
| 23 | 17710 |
| 24 | 21252 |
| 25 | 25300 |
| 26 | 29900 |
| 27 | 35100 |
| 28 | 40950 |
| 29 | 47502 |
| 30 | 54810 |
| 31 | 62930 |
| 32 | 71920 |
| 33 | 81840 |
| 34 | 92752 |
| 35 | 104720 |
| 36 | 117810 |
| 37 | 132090 |
| 38 | 147630 |
| 39 | 164502 |
| 40 | 182780 |