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 | 7 |
| 2 | 100 |
| 3 | 786 |
| 4 | 4420 |
| 5 | 19404 |
| 6 | 71188 |
| 7 | 226512 |
| 8 | 644231 |
| 9 | 1670015 |
| 10 | 4008200 |
| 11 | 9009728 |
| 12 | 19146090 |
| 13 | 38744496 |
| 14 | 75117600 |
| 15 | 140218218 |
| 16 | 253051227 |
| 17 | 443056383 |
| 18 | 754838884 |
| 19 | 1254576400 |
| 20 | 2038689796 |
| 21 | 3245256396 |
| 22 | 5069041432 |
| 23 | 7780827600 |
| 24 | 11752298725 |