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 | 1 |
| 4 | 57 |
| 5 | 486 |
| 6 | 2360 |
| 7 | 8394 |
| 8 | 24354 |
| 9 | 61104 |
| 10 | 137412 |
| 11 | 283635 |
| 12 | 546403 |
| 13 | 994422 |
| 14 | 1725516 |
| 15 | 2875028 |
| 16 | 4625700 |
| 17 | 7219152 |
| 18 | 10969080 |
| 19 | 16276293 |
| 20 | 23645709 |
| 21 | 33705430 |
| 22 | 47228016 |
| 23 | 65154078 |
| 24 | 88618310 |
| 25 | 118978080 |
| 26 | 157844700 |
| 27 | 207117495 |
| 28 | 269020791 |
| 29 | 346143942 |
| 30 | 441484516 |
| 31 | 558494760 |