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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 5 |
| 6 | 15 |
| 7 | 35 |
| 8 | 80 |
| 9 | 171 |
| 10 | 355 |
| 11 | 715 |
| 12 | 1410 |
| 13 | 2730 |
| 14 | 5208 |
| 15 | 9810 |
| 16 | 18280 |
| 17 | 33745 |
| 18 | 61785 |
| 19 | 112309 |
| 20 | 202840 |
| 21 | 364245 |
| 22 | 650705 |
| 23 | 1157015 |
| 24 | 2048532 |
| 25 | 3612900 |
| 26 | 6349200 |
| 27 | 11121300 |
| 28 | 19421150 |
| 29 | 33820061 |
| 30 | 58740915 |
| 31 | 101777495 |
| 32 | 175945280 |
| 33 | 303516015 |
| 34 | 522541903 |
| 35 | 897942115 |