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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 13 |
| 6 | 25 |
| 7 | 41 |
| 8 | 85 |
| 9 | 205 |
| 10 | 473 |
| 11 | 985 |
| 12 | 2021 |
| 13 | 4365 |
| 14 | 9785 |
| 15 | 21673 |
| 16 | 46965 |
| 17 | 101581 |
| 18 | 222745 |
| 19 | 492665 |
| 20 | 1087237 |
| 21 | 2388749 |
| 22 | 5251065 |
| 23 | 11587529 |
| 24 | 25633045 |
| 25 | 56697933 |
| 26 | 125345113 |
| 27 | 277283353 |
| 28 | 614212133 |
| 29 | 1361824525 |
| 30 | 3020426681 |
| 31 | 6700678377 |