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 | 36 |
| 2 | 630 |
| 3 | 7176 |
| 4 | 60165 |
| 5 | 398412 |
| 6 | 2184078 |
| 7 | 10255320 |
| 8 | 42321942 |
| 9 | 156590980 |
| 10 | 527649912 |
| 11 | 1639560888 |
| 12 | 4745867595 |
| 13 | 12904341336 |
| 14 | 33190117110 |
| 15 | 81222775680 |
| 16 | 190066236318 |
| 17 | 427113304920 |
| 18 | 925107172122 |
| 19 | 1937505253320 |
| 20 | 3934709716500 |
| 21 | 7767340567380 |
| 22 | 14937197788890 |