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 | 0 |
| 4 | 3 |
| 5 | 6 |
| 6 | 21 |
| 7 | 36 |
| 8 | 93 |
| 9 | 150 |
| 10 | 345 |
| 11 | 540 |
| 12 | 1173 |
| 13 | 1806 |
| 14 | 3801 |
| 15 | 5796 |
| 16 | 11973 |
| 17 | 18150 |
| 18 | 37065 |
| 19 | 55980 |
| 20 | 113493 |
| 21 | 171006 |
| 22 | 345081 |
| 23 | 519156 |
| 24 | 1044453 |
| 25 | 1569750 |
| 26 | 3151785 |
| 27 | 4733820 |
| 28 | 9492213 |
| 29 | 14250606 |
| 30 | 28550361 |
| 31 | 42850116 |
| 32 | 85798533 |
| 33 | 128746950 |
| 34 | 257690505 |
| 35 | 386634060 |
| 36 | 773661333 |