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 | 21 |
| 3 | 156 |
| 4 | 700 |
| 5 | 2325 |
| 6 | 6321 |
| 7 | 14896 |
| 8 | 31536 |
| 9 | 61425 |
| 10 | 111925 |
| 11 | 193116 |
| 12 | 318396 |
| 13 | 505141 |
| 14 | 775425 |
| 15 | 1156800 |
| 16 | 1683136 |
| 17 | 2395521 |
| 18 | 3343221 |
| 19 | 4584700 |
| 20 | 6188700 |
| 21 | 8235381 |
| 22 | 10817521 |
| 23 | 14041776 |
| 24 | 18030000 |
| 25 | 22920625 |
| 26 | 28870101 |
| 27 | 36054396 |
| 28 | 44670556 |
| 29 | 54938325 |
| 30 | 67101825 |
| 31 | 81431296 |
| 32 | 98224896 |