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 | 6 |
| 2 | 30 |
| 3 | 150 |
| 4 | 750 |
| 5 | 3750 |
| 6 | 18750 |
| 7 | 93750 |
| 8 | 468750 |
| 9 | 2343750 |
| 10 | 11718735 |
| 11 | 58593600 |
| 12 | 292967640 |
| 13 | 1464836400 |
| 14 | 7324173000 |
| 15 | 36620820000 |
| 16 | 183103875000 |
| 17 | 915518250000 |
| 18 | 4577585625000 |
| 19 | 22887900000000 |
| 20 | 114439359375210 |
| 21 | 572196093753000 |
| 22 | 2860976953154040 |
| 23 | 14304867187737000 |