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 | 4 |
| 2 | 10 |
| 3 | 24 |
| 4 | 56 |
| 5 | 128 |
| 6 | 294 |
| 7 | 676 |
| 8 | 1552 |
| 9 | 3564 |
| 10 | 8186 |
| 11 | 18800 |
| 12 | 43176 |
| 13 | 99160 |
| 14 | 227734 |
| 15 | 523020 |
| 16 | 1201184 |
| 17 | 2758676 |
| 18 | 6335658 |
| 19 | 14550664 |
| 20 | 33417496 |
| 21 | 76747632 |
| 22 | 176260934 |
| 23 | 404806196 |
| 24 | 929690160 |
| 25 | 2135154556 |
| 26 | 4903660570 |
| 27 | 11261895264 |
| 28 | 25864409480 |
| 29 | 59400985544 |
| 30 | 136422101046 |
| 31 | 313311125788 |
| 32 | 719559813184 |