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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 22 |
| 5 | 52 |
| 6 | 120 |
| 7 | 272 |
| 8 | 608 |
| 9 | 1344 |
| 10 | 2944 |
| 11 | 6400 |
| 12 | 13824 |
| 13 | 29696 |
| 14 | 63488 |
| 15 | 135168 |
| 16 | 286720 |
| 17 | 606208 |
| 18 | 1277952 |
| 19 | 2686976 |
| 20 | 5636096 |
| 21 | 11796480 |
| 22 | 24641536 |
| 23 | 51380224 |
| 24 | 106954752 |
| 25 | 222298112 |
| 26 | 461373440 |
| 27 | 956301312 |
| 28 | 1979711488 |
| 29 | 4093640704 |
| 30 | 8455716864 |
| 31 | 17448304640 |
| 32 | 35970351104 |