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 | 0 |
| 4 | 0 |
| 5 | 8 |
| 6 | 28 |
| 7 | 74 |
| 8 | 175 |
| 9 | 377 |
| 10 | 799 |
| 11 | 1673 |
| 12 | 3471 |
| 13 | 7192 |
| 14 | 14784 |
| 15 | 30208 |
| 16 | 61440 |
| 17 | 124416 |
| 18 | 251328 |
| 19 | 506712 |
| 20 | 1020015 |
| 21 | 2051015 |
| 22 | 4119775 |
| 23 | 8268215 |
| 24 | 16582735 |
| 25 | 33239558 |
| 26 | 66599068 |
| 27 | 133392344 |
| 28 | 267099120 |
| 29 | 534709192 |
| 30 | 1070244924 |
| 31 | 2141826898 |
| 32 | 4285816671 |
| 33 | 8575127217 |