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 | 9 |
| 2 | 45 |
| 3 | 126 |
| 4 | 270 |
| 5 | 495 |
| 6 | 819 |
| 7 | 1260 |
| 8 | 1836 |
| 9 | 2565 |
| 10 | 3465 |
| 11 | 4554 |
| 12 | 5850 |
| 13 | 7371 |
| 14 | 9135 |
| 15 | 11160 |
| 16 | 13464 |
| 17 | 16065 |
| 18 | 18981 |
| 19 | 22230 |
| 20 | 25830 |
| 21 | 29799 |
| 22 | 34155 |
| 23 | 38916 |
| 24 | 44100 |
| 25 | 49725 |
| 26 | 55809 |
| 27 | 62370 |
| 28 | 69426 |
| 29 | 76995 |
| 30 | 85095 |
| 31 | 93744 |
| 32 | 102960 |
| 33 | 112761 |
| 34 | 123165 |
| 35 | 134190 |
| 36 | 145854 |
| 37 | 158175 |
| 38 | 171171 |
| 39 | 184860 |
| 40 | 199260 |