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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 6 |
| 7 | 23 |
| 8 | 77 |
| 9 | 240 |
| 10 | 705 |
| 11 | 1988 |
| 12 | 5468 |
| 13 | 14724 |
| 14 | 39006 |
| 15 | 101818 |
| 16 | 261924 |
| 17 | 663748 |
| 18 | 1655781 |
| 19 | 4062110 |
| 20 | 9793065 |
| 21 | 23186825 |
| 22 | 53896597 |
| 23 | 122975627 |
| 24 | 275449464 |
| 25 | 605794093 |
| 26 | 1308633243 |
| 27 | 2777847319 |
| 28 | 5797093774 |
| 29 | 11900199553 |
| 30 | 24042491094 |
| 31 | 47833081481 |
| 32 | 93765335118 |
| 33 | 181200186060 |
| 34 | 345389067067 |
| 35 | 649704599010 |