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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 19 |
| 8 | 54 |
| 9 | 147 |
| 10 | 418 |
| 11 | 1150 |
| 12 | 3254 |
| 13 | 9138 |
| 14 | 25953 |
| 15 | 73717 |
| 16 | 210719 |
| 17 | 603370 |
| 18 | 1734739 |
| 19 | 4998542 |
| 20 | 14444576 |
| 21 | 41829991 |
| 22 | 121406927 |
| 23 | 353029078 |
| 24 | 1028417980 |
| 25 | 3000754648 |
| 26 | 8769118355 |
| 27 | 25661830891 |
| 28 | 75194886765 |
| 29 | 220605144778 |
| 30 | 647942827064 |
| 31 | 1905103686527 |
| 32 | 5607037213434 |
| 33 | 16517892572160 |
| 34 | 48703328674762 |