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 | 205 |
| 2 | 12207 |
| 3 | 180150 |
| 4 | 1345210 |
| 5 | 6698715 |
| 6 | 25491585 |
| 7 | 80090332 |
| 8 | 217992420 |
| 9 | 530736345 |
| 10 | 1181964355 |
| 11 | 2447218290 |
| 12 | 4768371582 |
| 13 | 8825923015 |
| 14 | 15632700405 |
| 15 | 26652844920 |
| 16 | 43950269320 |
| 17 | 70371105957 |
| 18 | 109764982935 |
| 19 | 167250289390 |
| 20 | 249528913410 |
| 21 | 365256258675 |
| 22 | 525472668457 |
| 23 | 744102708180 |