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 | 7 |
| 2 | 28 |
| 3 | 100 |
| 4 | 358 |
| 5 | 1288 |
| 6 | 4636 |
| 7 | 16684 |
| 8 | 60040 |
| 9 | 216064 |
| 10 | 777544 |
| 11 | 2798128 |
| 12 | 10069552 |
| 13 | 36237040 |
| 14 | 130405312 |
| 15 | 469286272 |
| 16 | 1688808544 |
| 17 | 6077472256 |
| 18 | 21870844480 |
| 19 | 78706050496 |
| 20 | 283237457536 |
| 21 | 1019279418112 |
| 22 | 3668054858368 |
| 23 | 13200135512320 |