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 | 2 |
| 5 | 23 |
| 6 | 127 |
| 7 | 468 |
| 8 | 1352 |
| 9 | 3310 |
| 10 | 7190 |
| 11 | 14260 |
| 12 | 26330 |
| 13 | 45885 |
| 14 | 76237 |
| 15 | 121688 |
| 16 | 187712 |
| 17 | 281148 |
| 18 | 410412 |
| 19 | 585720 |
| 20 | 819330 |
| 21 | 1125795 |
| 22 | 1522235 |
| 23 | 2028620 |
| 24 | 2668072 |
| 25 | 3467178 |
| 26 | 4456322 |
| 27 | 5670028 |
| 28 | 7147322 |
| 29 | 8932105 |
| 30 | 11073545 |
| 31 | 13626480 |
| 32 | 16651840 |
| 33 | 20217080 |