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 | 4 |
| 3 | 7 |
| 4 | 21 |
| 5 | 40 |
| 6 | 106 |
| 7 | 216 |
| 8 | 534 |
| 9 | 1139 |
| 10 | 2715 |
| 11 | 5962 |
| 12 | 14012 |
| 13 | 31420 |
| 14 | 73484 |
| 15 | 167617 |
| 16 | 392714 |
| 17 | 908600 |
| 18 | 2140429 |
| 19 | 5015655 |
| 20 | 11905145 |
| 21 | 28228533 |
| 22 | 67590229 |
| 23 | 162067916 |
| 24 | 391695348 |
| 25 | 949359190 |
| 26 | 2316618809 |
| 27 | 5673557284 |
| 28 | 13979155798 |
| 29 | 34583650498 |
| 30 | 86034613145 |
| 31 | 214948212879 |