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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 21 |
| 5 | 50 |
| 6 | 121 |
| 7 | 297 |
| 8 | 736 |
| 9 | 1837 |
| 10 | 4610 |
| 11 | 11618 |
| 12 | 29379 |
| 13 | 74500 |
| 14 | 189362 |
| 15 | 482282 |
| 16 | 1230460 |
| 17 | 3144137 |
| 18 | 8045057 |
| 19 | 20610526 |
| 20 | 52860253 |
| 21 | 135707819 |
| 22 | 348720196 |
| 23 | 896833527 |
| 24 | 2308229426 |
| 25 | 5944998971 |
| 26 | 15321681454 |
| 27 | 39511323139 |
| 28 | 101947848801 |
| 29 | 263183509040 |
| 30 | 679747862389 |
| 31 | 1756432848707 |
| 32 | 4540430713995 |