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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 21 |
| 6 | 61 |
| 7 | 141 |
| 8 | 309 |
| 9 | 757 |
| 10 | 2111 |
| 11 | 6051 |
| 12 | 16721 |
| 13 | 44617 |
| 14 | 118301 |
| 15 | 318501 |
| 16 | 871781 |
| 17 | 2400741 |
| 18 | 6596953 |
| 19 | 18067329 |
| 20 | 49460555 |
| 21 | 135697395 |
| 22 | 373271515 |
| 23 | 1028451579 |
| 24 | 2835353337 |
| 25 | 7819016521 |
| 26 | 21572619771 |
| 27 | 59562583471 |
| 28 | 164586609409 |
| 29 | 455114644297 |
| 30 | 1259191262441 |
| 31 | 3485551053561 |