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 | 5 |
| 4 | 21 |
| 5 | 63 |
| 6 | 135 |
| 7 | 270 |
| 8 | 462 |
| 9 | 770 |
| 10 | 1170 |
| 11 | 1755 |
| 12 | 2475 |
| 13 | 3465 |
| 14 | 4641 |
| 15 | 6188 |
| 16 | 7980 |
| 17 | 10260 |
| 18 | 12852 |
| 19 | 16065 |
| 20 | 19665 |
| 21 | 24035 |
| 22 | 28875 |
| 23 | 34650 |
| 24 | 40986 |
| 25 | 48438 |
| 26 | 56550 |
| 27 | 65975 |
| 28 | 76167 |
| 29 | 87885 |
| 30 | 100485 |
| 31 | 114840 |
| 32 | 130200 |
| 33 | 147560 |
| 34 | 166056 |
| 35 | 186813 |
| 36 | 208845 |
| 37 | 233415 |
| 38 | 259407 |
| 39 | 288230 |
| 40 | 318630 |