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 | 2 |
| 2 | 24 |
| 3 | 146 |
| 4 | 608 |
| 5 | 1970 |
| 6 | 5336 |
| 7 | 12642 |
| 8 | 27008 |
| 9 | 53154 |
| 10 | 97880 |
| 11 | 170610 |
| 12 | 284000 |
| 13 | 454610 |
| 14 | 703640 |
| 15 | 1057730 |
| 16 | 1549824 |
| 17 | 2220098 |
| 18 | 3116952 |
| 19 | 4298066 |
| 20 | 5831520 |
| 21 | 7796978 |
| 22 | 10286936 |
| 23 | 13408034 |
| 24 | 17282432 |
| 25 | 22049250 |
| 26 | 27866072 |
| 27 | 34910514 |
| 28 | 43381856 |
| 29 | 53502738 |
| 30 | 65520920 |
| 31 | 79711106 |