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 | 0 |
| 1 | 1 |
| 2 | 18 |
| 3 | 84 |
| 4 | 292 |
| 5 | 630 |
| 6 | 1512 |
| 7 | 2408 |
| 8 | 4680 |
| 9 | 6813 |
| 10 | 11340 |
| 11 | 14652 |
| 12 | 24528 |
| 13 | 28574 |
| 14 | 43344 |
| 15 | 52920 |
| 16 | 74896 |
| 17 | 83538 |
| 18 | 122634 |
| 19 | 130340 |
| 20 | 183960 |
| 21 | 202272 |
| 22 | 263736 |
| 23 | 279864 |
| 24 | 393120 |
| 25 | 393775 |
| 26 | 514332 |
| 27 | 551880 |
| 28 | 703136 |
| 29 | 707310 |
| 30 | 952560 |
| 31 | 923552 |
| 32 | 1198368 |
| 33 | 1230768 |
| 34 | 1503684 |
| 35 | 1517040 |
| 36 | 1989396 |
| 37 | 1874198 |
| 38 | 2346120 |
| 39 | 2400216 |
| 40 | 2948400 |