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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 9 |
| 6 | 23 |
| 7 | 39 |
| 8 | 97 |
| 9 | 197 |
| 10 | 465 |
| 11 | 969 |
| 12 | 2161 |
| 13 | 4605 |
| 14 | 10202 |
| 15 | 22051 |
| 16 | 48438 |
| 17 | 105028 |
| 18 | 229692 |
| 19 | 499620 |
| 20 | 1091268 |
| 21 | 2376641 |
| 22 | 5185742 |
| 23 | 11299467 |
| 24 | 24645179 |
| 25 | 53718931 |
| 26 | 117144203 |
| 27 | 255371099 |
| 28 | 556824105 |
| 29 | 1213941393 |
| 30 | 2646824821 |
| 31 | 5770590379 |