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 | 5 |
| 3 | 31 |
| 4 | 184 |
| 5 | 924 |
| 6 | 3809 |
| 7 | 13197 |
| 8 | 39675 |
| 9 | 106357 |
| 10 | 259669 |
| 11 | 586829 |
| 12 | 1242946 |
| 13 | 2491516 |
| 14 | 4763097 |
| 15 | 8738111 |
| 16 | 15461061 |
| 17 | 26494977 |
| 18 | 44126629 |
| 19 | 71634979 |
| 20 | 113637500 |
| 21 | 176531380 |
| 22 | 269049265 |
| 23 | 402952089 |
| 24 | 593884703 |
| 25 | 862423461 |
| 26 | 1235348661 |
| 27 | 1747178785 |