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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 5 |
| 6 | 44 |
| 7 | 147 |
| 8 | 464 |
| 9 | 1236 |
| 10 | 3100 |
| 11 | 7293 |
| 12 | 16472 |
| 13 | 35919 |
| 14 | 76216 |
| 15 | 158040 |
| 16 | 321472 |
| 17 | 643229 |
| 18 | 1268868 |
| 19 | 2472147 |
| 20 | 4764120 |
| 21 | 9092300 |
| 22 | 17202636 |
| 23 | 32294277 |
| 24 | 60199088 |
| 25 | 111498175 |
| 26 | 205306192 |
| 27 | 376014960 |
| 28 | 685273120 |
| 29 | 1243205205 |
| 30 | 2245893340 |
| 31 | 4041415347 |
| 32 | 7245914176 |
| 33 | 12947137412 |