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 | 0 |
| 2 | 0 |
| 3 | 58 |
| 4 | 18343 |
| 5 | 362643 |
| 6 | 2911226 |
| 7 | 14601844 |
| 8 | 54738489 |
| 9 | 168157793 |
| 10 | 446728228 |
| 11 | 1062085146 |
| 12 | 2312934779 |
| 13 | 4690690399 |
| 14 | 8967633918 |
| 15 | 16312226288 |
| 16 | 28436620141 |
| 17 | 47781858189 |
| 18 | 77746670984 |
| 19 | 122966217718 |
| 20 | 189647543823 |
| 21 | 285968959211 |
| 22 | 422550971074 |
| 23 | 613006835244 |