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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 23 |
| 6 | 61 |
| 7 | 135 |
| 8 | 306 |
| 9 | 679 |
| 10 | 1499 |
| 11 | 3257 |
| 12 | 7053 |
| 13 | 15167 |
| 14 | 32443 |
| 15 | 69080 |
| 16 | 146533 |
| 17 | 309743 |
| 18 | 652762 |
| 19 | 1371897 |
| 20 | 2876284 |
| 21 | 6017100 |
| 22 | 12562511 |
| 23 | 26180328 |
| 24 | 54469099 |
| 25 | 113151406 |
| 26 | 234723068 |
| 27 | 486276265 |
| 28 | 1006195365 |
| 29 | 2079647131 |
| 30 | 4293758081 |
| 31 | 8856361762 |
| 32 | 18250277543 |