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 | 30 |
| 2 | 546 |
| 3 | 3900 |
| 4 | 17220 |
| 5 | 56730 |
| 6 | 153510 |
| 7 | 360696 |
| 8 | 762120 |
| 9 | 1482390 |
| 10 | 2698410 |
| 11 | 4652340 |
| 12 | 7665996 |
| 13 | 12156690 |
| 14 | 18654510 |
| 15 | 27821040 |
| 16 | 40469520 |
| 17 | 57586446 |
| 18 | 80354610 |
| 19 | 110177580 |
| 20 | 148705620 |
| 21 | 197863050 |
| 22 | 259877046 |
| 23 | 337307880 |
| 24 | 433080600 |
| 25 | 550518150 |
| 26 | 693375930 |
| 27 | 865877796 |
| 28 | 1072753500 |
| 29 | 1319277570 |
| 30 | 1611309630 |