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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 14 |
| 7 | 27 |
| 8 | 54 |
| 9 | 106 |
| 10 | 212 |
| 11 | 420 |
| 12 | 840 |
| 13 | 1673 |
| 14 | 3346 |
| 15 | 6678 |
| 16 | 13356 |
| 17 | 26685 |
| 18 | 53370 |
| 19 | 106686 |
| 20 | 213372 |
| 21 | 426638 |
| 22 | 853276 |
| 23 | 1706340 |
| 24 | 3412680 |
| 25 | 6824940 |
| 26 | 13649880 |
| 27 | 27298920 |
| 28 | 54597840 |
| 29 | 109194007 |
| 30 | 218388014 |
| 31 | 436772682 |
| 32 | 873545364 |
| 33 | 1747084050 |
| 34 | 3494168100 |
| 35 | 6988322844 |
| 36 | 13976645688 |