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 | 10 |
| 2 | 120 |
| 3 | 1330 |
| 4 | 14640 |
| 5 | 161050 |
| 6 | 1771560 |
| 7 | 19487170 |
| 8 | 214358880 |
| 9 | 2357947690 |
| 10 | 25937424600 |
| 11 | 285311670610 |
| 12 | 3138428376720 |
| 13 | 34522712143930 |
| 14 | 379749833583240 |
| 15 | 4177248169415650 |
| 16 | 45949729863572160 |
| 17 | 505447028499293770 |