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) |
|---|---|
| 2 | 1 |
| 3 | 7 |
| 4 | 34 |
| 5 | 173 |
| 6 | 741 |
| 7 | 3549 |
| 8 | 14670 |
| 9 | 68683 |
| 10 | 279715 |
| 11 | 1294598 |
| 12 | 5233060 |
| 13 | 24052965 |
| 14 | 96822587 |
| 15 | 442972139 |
| 16 | 1778697948 |
| 17 | 8110611295 |
| 18 | 32516501991 |
| 19 | 147897243768 |
| 20 | 592346459071 |
| 21 | 2688895275974 |
| 22 | 10762289869782 |
| 23 | 48776681304283 |
| 24 | 195143578562778 |
| 25 | 883272843800993 |
| 26 | 3532739195660162 |