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 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 24 |
| 4 | 72 |
| 5 | 196 |
| 6 | 532 |
| 7 | 1368 |
| 8 | 3467 |
| 9 | 8520 |
| 10 | 20580 |
| 11 | 48664 |
| 12 | 113330 |
| 13 | 259588 |
| 14 | 586692 |
| 15 | 1308304 |
| 16 | 2883427 |
| 17 | 6283192 |
| 18 | 13551344 |
| 19 | 28940688 |
| 20 | 61246052 |
| 21 | 128492516 |
| 22 | 267388008 |
| 23 | 552126648 |
| 24 | 1131750735 |
| 25 | 2303690862 |
| 26 | 4658080756 |
| 27 | 9358912416 |
| 28 | 18689701580 |
| 29 | 37106245300 |
| 30 | 73259451208 |