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 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | 14 |
| 8 | 12 |
| 9 | 8 |
| 10 | 28 |
| 11 | 58 |
| 12 | 44 |
| 13 | 120 |
| 14 | 254 |
| 15 | 226 |
| 16 | 344 |
| 17 | 932 |
| 18 | 1262 |
| 19 | 1380 |
| 20 | 2958 |
| 21 | 5006 |
| 22 | 5632 |
| 23 | 9496 |
| 24 | 18204 |
| 25 | 23756 |
| 26 | 32758 |
| 27 | 59992 |
| 28 | 90494 |
| 29 | 118740 |
| 30 | 196318 |
| 31 | 320814 |
| 32 | 437270 |
| 33 | 653770 |
| 34 | 1077580 |
| 35 | 1570054 |
| 36 | 2233920 |
| 37 | 3551168 |
| 38 | 5426452 |
| 39 | 7714408 |
| 40 | 11709864 |