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 | 1 |
| 5 | 1 |
| 6 | 5 |
| 7 | 4 |
| 8 | 18 |
| 9 | 19 |
| 10 | 72 |
| 11 | 72 |
| 12 | 268 |
| 13 | 276 |
| 14 | 1002 |
| 15 | 1043 |
| 16 | 3733 |
| 17 | 3926 |
| 18 | 14000 |
| 19 | 14810 |
| 20 | 52658 |
| 21 | 55987 |
| 22 | 199020 |
| 23 | 212364 |
| 24 | 754826 |
| 25 | 807861 |
| 26 | 2872926 |
| 27 | 3082202 |
| 28 | 10966333 |
| 29 | 11789248 |
| 30 | 41970489 |
| 31 | 45198317 |
| 32 | 160996986 |
| 33 | 173640109 |
| 34 | 618839771 |
| 35 | 668316169 |
| 36 | 2383000591 |
| 37 | 2576516523 |
| 38 | 9191269314 |
| 39 | 9947949563 |
| 40 | 35502661446 |