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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 34 |
| 5 | 182 |
| 6 | 282 |
| 7 | 2034 |
| 8 | 4908 |
| 9 | 15564 |
| 10 | 20100 |
| 11 | 223620 |
| 12 | 251340 |
| 13 | 3295140 |
| 14 | 3964380 |
| 15 | 4324740 |
| 16 | 9370200 |
| 17 | 160014120 |
| 18 | 180434520 |
| 19 | 3440508120 |
| 20 | 3673300680 |
| 21 | 3906093240 |
| 22 | 4350515400 |
| 23 | 100294646760 |
| 24 | 105648875640 |
| 25 | 533598607080 |
| 26 | 585081577080 |