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 | 21 |
| 1 | 28 |
| 2 | 44 |
| 3 | 82 |
| 4 | 176 |
| 5 | 418 |
| 6 | 1064 |
| 7 | 2842 |
| 8 | 7856 |
| 9 | 22258 |
| 10 | 64184 |
| 11 | 187402 |
| 12 | 551936 |
| 13 | 1635298 |
| 14 | 4864904 |
| 15 | 14512762 |
| 16 | 43374416 |
| 17 | 129795538 |
| 18 | 388731224 |
| 19 | 1164882922 |
| 20 | 3492027296 |
| 21 | 10470838978 |
| 22 | 31402031144 |
| 23 | 94185121882 |
| 24 | 282513422576 |
| 25 | 847456381618 |
| 26 | 2542201372664 |
| 27 | 7626268573642 |
| 28 | 22878134632256 |
| 29 | 68633061719458 |
| 30 | 205896500803784 |
| 31 | 617684133702202 |