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) |
|---|---|
| 3 | 8 |
| 4 | 52 |
| 5 | 288 |
| 6 | 1424 |
| 7 | 6648 |
| 8 | 29700 |
| 9 | 128800 |
| 10 | 545600 |
| 11 | 2269672 |
| 12 | 9303140 |
| 13 | 37672216 |
| 14 | 150998016 |
| 15 | 599988696 |
| 16 | 2366216164 |
| 17 | 9270987656 |
| 18 | 36116062832 |
| 19 | 139978757920 |
| 20 | 540069059028 |
| 21 | 2075217121688 |
| 22 | 7944690769952 |
| 23 | 30313624200640 |
| 24 | 115312027433188 |
| 25 | 437420730644304 |
| 26 | 1655047867097280 |
| 27 | 6247339311097296 |
| 28 | 23530440547115428 |
| 29 | 88447214709073696 |
| 30 | 331832490378209152 |
| 31 | 1242766581420901656 |
| 32 | 4646714574562484628 |
| 33 | 17347357264162110368 |
| 34 | 64668460220964604944 |
| 35 | 240747014238189337840 |
| 36 | 895102104022837748484 |
| 37 | 3323982608759454833032 |
| 38 | 12329573838525875316560 |
| 39 | 45684294664598118867184 |
| 40 | 169098457957523787786644 |