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 | 7 |
| 4 | 20 |
| 5 | 62 |
| 6 | 217 |
| 7 | 803 |
| 8 | 3092 |
| 9 | 12128 |
| 10 | 48047 |
| 11 | 191266 |
| 12 | 763249 |
| 13 | 3049383 |
| 14 | 12190360 |
| 15 | 48747140 |
| 16 | 194960047 |
| 17 | 779783252 |
| 18 | 3119019290 |
| 19 | 12475849884 |
| 20 | 49902945245 |
| 21 | 199610872683 |
| 22 | 798441674561 |
| 23 | 3193763066392 |
| 24 | 12775045002551 |
| 25 | 51100165484967 |
| 26 | 204400632890492 |