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 | 32 |
| 4 | 135 |
| 5 | 605 |
| 6 | 2560 |
| 7 | 10933 |
| 8 | 46305 |
| 9 | 196384 |
| 10 | 831875 |
| 11 | 3524489 |
| 12 | 14929920 |
| 13 | 63245753 |
| 14 | 267913165 |
| 15 | 1134902560 |
| 16 | 4807524015 |
| 17 | 20365009477 |
| 18 | 86267563520 |
| 19 | 365435291981 |
| 20 | 1548008735625 |
| 21 | 6557470308896 |
| 22 | 27777889982155 |
| 23 | 117669030432337 |
| 24 | 498454011740160 |
| 25 | 2111485077903025 |