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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 45 |
| 6 | 174 |
| 7 | 825 |
| 8 | 4738 |
| 9 | 32137 |
| 10 | 251338 |
| 11 | 2224157 |
| 12 | 21952358 |
| 13 | 238962581 |
| 14 | 2843085270 |
| 15 | 36696680241 |
| 16 | 510647009850 |
| 17 | 7619901954001 |
| 18 | 121367981060434 |
| 19 | 2055085325869813 |
| 20 | 36861997532438654 |
| 21 | 698193329457246653 |
| 22 | 13924819967953406654 |
| 23 | 291683979376372766697 |
| 24 | 6402385486361598687666 |
| 25 | 146948520147021794869977 |