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 | 3 |
| 3 | 9 |
| 4 | 27 |
| 5 | 79 |
| 6 | 229 |
| 7 | 657 |
| 8 | 1873 |
| 9 | 5304 |
| 10 | 14944 |
| 11 | 41895 |
| 12 | 116947 |
| 13 | 325133 |
| 14 | 900617 |
| 15 | 2486183 |
| 16 | 6841490 |
| 17 | 18770754 |
| 18 | 51358188 |
| 19 | 140154540 |
| 20 | 381540434 |
| 21 | 1036261537 |
| 22 | 2808328337 |
| 23 | 7594958401 |
| 24 | 20499680869 |
| 25 | 55227373266 |
| 26 | 148520150761 |
| 27 | 398726637407 |
| 28 | 1068701794158 |
| 29 | 2859956501816 |
| 30 | 7642086948143 |
| 31 | 20391083977989 |
| 32 | 54333644617311 |