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 | 5 |
| 2 | 20 |
| 3 | 65 |
| 4 | 190 |
| 5 | 506 |
| 6 | 1265 |
| 7 | 2986 |
| 8 | 6745 |
| 9 | 14645 |
| 10 | 30767 |
| 11 | 62745 |
| 12 | 124706 |
| 13 | 242110 |
| 14 | 460337 |
| 15 | 858673 |
| 16 | 1574140 |
| 17 | 2839862 |
| 18 | 5048435 |
| 19 | 8852562 |
| 20 | 15327290 |
| 21 | 26224173 |
| 22 | 44372688 |
| 23 | 74301095 |
| 24 | 123200079 |
| 25 | 202394897 |
| 26 | 329596348 |
| 27 | 532299955 |
| 28 | 852914900 |
| 29 | 1356426196 |
| 30 | 2141819621 |