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) |
|---|---|
| 2 | 4 |
| 3 | 9 |
| 4 | 30 |
| 5 | 61 |
| 6 | 160 |
| 7 | 301 |
| 8 | 718 |
| 9 | 1305 |
| 10 | 3000 |
| 11 | 5377 |
| 12 | 12190 |
| 13 | 21733 |
| 14 | 49024 |
| 15 | 87237 |
| 16 | 196446 |
| 17 | 349345 |
| 18 | 786232 |
| 19 | 1397881 |
| 20 | 3145486 |
| 21 | 5592141 |
| 22 | 12582624 |
| 23 | 22369309 |
| 24 | 50331310 |
| 25 | 89478121 |
| 26 | 201326200 |
| 27 | 357913521 |
| 28 | 805305918 |
| 29 | 1431655285 |
| 30 | 3221224960 |
| 31 | 5726622517 |
| 32 | 12884901310 |
| 33 | 22906491633 |