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 | 2 |
| 4 | 3 |
| 5 | 6 |
| 6 | 12 |
| 7 | 27 |
| 8 | 63 |
| 9 | 155 |
| 10 | 402 |
| 11 | 1087 |
| 12 | 3068 |
| 13 | 8996 |
| 14 | 27340 |
| 15 | 85905 |
| 16 | 278485 |
| 17 | 929713 |
| 18 | 3191201 |
| 19 | 11245603 |
| 20 | 40631628 |
| 21 | 150342633 |
| 22 | 569071745 |
| 23 | 2201355134 |
| 24 | 8694775795 |
| 25 | 35035655103 |
| 26 | 143916920872 |
| 27 | 602218550964 |
| 28 | 2565370007349 |
| 29 | 11118142868084 |
| 30 | 48994958103507 |