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 | 1 |
| 3 | 4 |
| 4 | 12 |
| 5 | 44 |
| 6 | 175 |
| 7 | 718 |
| 8 | 3052 |
| 9 | 13308 |
| 10 | 59139 |
| 11 | 266974 |
| 12 | 1220879 |
| 13 | 5643562 |
| 14 | 26327769 |
| 15 | 123793450 |
| 16 | 586078393 |
| 17 | 2791408028 |
| 18 | 13365916545 |
| 19 | 64302770488 |
| 20 | 310672722803 |
| 21 | 1506737267266 |
| 22 | 7332920012492 |
| 23 | 35800278685252 |
| 24 | 175286440178448 |
| 25 | 860517328379634 |
| 26 | 4234766396436095 |