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 | 5 |
| 2 | 62 |
| 3 | 1065 |
| 4 | 21714 |
| 5 | 492366 |
| 6 | 12004740 |
| 7 | 308559537 |
| 8 | 8255788970 |
| 9 | 227976044010 |
| 10 | 6457854821340 |
| 11 | 186814834574550 |
| 12 | 5500292590186380 |
| 13 | 164387681345290500 |
| 14 | 4976887208815547640 |
| 15 | 152378485941172462785 |
| 16 | 4711642301137121933850 |
| 17 | 146964278352052950118770 |
| 18 | 4619875954522866283392300 |