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 | 2 |
| 4 | 15 |
| 5 | 54 |
| 6 | 141 |
| 7 | 306 |
| 8 | 588 |
| 9 | 1036 |
| 10 | 1710 |
| 11 | 2682 |
| 12 | 4037 |
| 13 | 5874 |
| 14 | 8307 |
| 15 | 11466 |
| 16 | 15498 |
| 17 | 20568 |
| 18 | 26860 |
| 19 | 34578 |
| 20 | 43947 |
| 21 | 55214 |
| 22 | 68649 |
| 23 | 84546 |
| 24 | 103224 |
| 25 | 125028 |
| 26 | 150330 |
| 27 | 179530 |
| 28 | 213057 |
| 29 | 251370 |
| 30 | 294959 |
| 31 | 344346 |
| 32 | 400086 |
| 33 | 462768 |
| 34 | 533016 |
| 35 | 611490 |
| 36 | 698887 |
| 37 | 795942 |
| 38 | 903429 |
| 39 | 1022162 |