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 | 4 |
| 3 | 12 |
| 4 | 32 |
| 5 | 70 |
| 6 | 162 |
| 7 | 350 |
| 8 | 800 |
| 9 | 1746 |
| 10 | 3950 |
| 11 | 8602 |
| 12 | 19164 |
| 13 | 41392 |
| 14 | 90846 |
| 15 | 194490 |
| 16 | 421568 |
| 17 | 895594 |
| 18 | 1922022 |
| 19 | 4057298 |
| 20 | 8638580 |
| 21 | 18140640 |
| 22 | 38378054 |
| 23 | 80244562 |
| 24 | 168877272 |
| 25 | 351827100 |
| 26 | 737208082 |
| 27 | 1531123830 |
| 28 | 3196464740 |
| 29 | 6621247636 |
| 30 | 13779365430 |
| 31 | 28477354354 |
| 32 | 59102191488 |
| 33 | 121898268954 |