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 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 463 |
| 12 | 793 |
| 13 | 3004 |
| 14 | 5006 |
| 15 | 14444 |
| 16 | 23817 |
| 17 | 62323 |
| 18 | 14805403 |
| 19 | 35175993 |
| 20 | 177791475 |
| 21 | 745977222 |
| 22 | 2333540804 |
| 23 | 7589340982 |
| 24 | 29027728612 |
| 25 | 81515120641 |
| 26 | 23232813583331 |
| 27 | 69799133324911 |
| 28 | 436678552247551 |
| 29 | 2215090972333651 |
| 30 | 13529994077951557 |
| 31 | 48863594588239153 |