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 | 16 |
| 4 | 47 |
| 5 | 131 |
| 6 | 356 |
| 7 | 953 |
| 8 | 2529 |
| 9 | 6676 |
| 10 | 17567 |
| 11 | 46135 |
| 12 | 121016 |
| 13 | 317201 |
| 14 | 831053 |
| 15 | 2176712 |
| 16 | 5700303 |
| 17 | 14926171 |
| 18 | 39081404 |
| 19 | 102323209 |
| 20 | 267896585 |
| 21 | 701380076 |
| 22 | 1836265535 |
| 23 | 4807451951 |
| 24 | 12586147632 |
| 25 | 32951083681 |
| 26 | 86267253461 |
| 27 | 225850919488 |