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 | 0 |
| 3 | 2 |
| 4 | 8 |
| 5 | 28 |
| 6 | 77 |
| 7 | 202 |
| 8 | 490 |
| 9 | 1152 |
| 10 | 2624 |
| 11 | 5869 |
| 12 | 12913 |
| 13 | 28116 |
| 14 | 60660 |
| 15 | 130004 |
| 16 | 277065 |
| 17 | 587859 |
| 18 | 1242540 |
| 19 | 2617942 |
| 20 | 5500394 |
| 21 | 11528284 |
| 22 | 24109349 |
| 23 | 50321442 |
| 24 | 104844426 |
| 25 | 218086957 |
| 26 | 452963310 |
| 27 | 939496802 |
| 28 | 1946122511 |
| 29 | 4026488387 |
| 30 | 8321444573 |
| 31 | 17179801049 |
| 32 | 35433395265 |