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 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 30 |
| 6 | 70 |
| 7 | 167 |
| 8 | 405 |
| 9 | 992 |
| 10 | 2450 |
| 11 | 6090 |
| 12 | 15214 |
| 13 | 38165 |
| 14 | 96069 |
| 15 | 242530 |
| 16 | 613811 |
| 17 | 1556856 |
| 18 | 3956316 |
| 19 | 10070871 |
| 20 | 25674210 |
| 21 | 65541142 |
| 22 | 167517654 |
| 23 | 428635032 |
| 24 | 1097874434 |
| 25 | 2814611701 |
| 26 | 7221917871 |
| 27 | 18544968768 |
| 28 | 47655572191 |
| 29 | 122544150258 |
| 30 | 315313433594 |
| 31 | 811792614547 |