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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 25 |
| 7 | 69 |
| 8 | 193 |
| 9 | 565 |
| 10 | 1680 |
| 11 | 5113 |
| 12 | 15757 |
| 13 | 49223 |
| 14 | 155228 |
| 15 | 493937 |
| 16 | 1583002 |
| 17 | 5106386 |
| 18 | 16563542 |
| 19 | 53995678 |
| 20 | 176797966 |
| 21 | 581196445 |
| 22 | 1917446630 |
| 23 | 6346554919 |
| 24 | 21068877925 |
| 25 | 70133571797 |
| 26 | 234043258802 |
| 27 | 782831380626 |
| 28 | 2624022529690 |
| 29 | 8813080348897 |
| 30 | 29654400681966 |
| 31 | 99953565213645 |
| 32 | 337447946046906 |
| 33 | 1140961171059563 |