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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 17 |
| 6 | 40 |
| 7 | 90 |
| 8 | 198 |
| 9 | 430 |
| 10 | 922 |
| 11 | 1956 |
| 12 | 4115 |
| 13 | 8597 |
| 14 | 17853 |
| 15 | 36883 |
| 16 | 75856 |
| 17 | 155396 |
| 18 | 317228 |
| 19 | 645580 |
| 20 | 1310132 |
| 21 | 2652072 |
| 22 | 5356277 |
| 23 | 10795351 |
| 24 | 21716195 |
| 25 | 43608549 |
| 26 | 87429944 |
| 27 | 175025918 |
| 28 | 349901074 |
| 29 | 698604058 |
| 30 | 1393149486 |
| 31 | 2775103948 |
| 32 | 5522129511 |
| 33 | 10977608425 |