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 | 1 |
| 2 | 40 |
| 3 | 60 |
| 4 | 99 |
| 5 | 4100 |
| 6 | 6100 |
| 7 | 10101 |
| 8 | 418140 |
| 9 | 622160 |
| 10 | 1030199 |
| 11 | 42646200 |
| 12 | 63454200 |
| 13 | 105070201 |
| 14 | 4349494240 |
| 15 | 6471706260 |
| 16 | 10716130299 |
| 17 | 443605766300 |
| 18 | 660050584300 |
| 19 | 1092940220301 |
| 20 | 45243438668340 |
| 21 | 67318687892360 |
| 22 | 111469186340399 |
| 23 | 4614387138404400 |