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 | 2 |
| 3 | 4 |
| 4 | 10 |
| 5 | 24 |
| 6 | 54 |
| 7 | 116 |
| 8 | 242 |
| 9 | 496 |
| 10 | 1006 |
| 11 | 2028 |
| 12 | 4074 |
| 13 | 8168 |
| 14 | 16358 |
| 15 | 32740 |
| 16 | 65506 |
| 17 | 131040 |
| 18 | 262110 |
| 19 | 524252 |
| 20 | 1048538 |
| 21 | 2097112 |
| 22 | 4194262 |
| 23 | 8388564 |
| 24 | 16777170 |
| 25 | 33554384 |
| 26 | 67108814 |
| 27 | 134217676 |
| 28 | 268435402 |
| 29 | 536870856 |
| 30 | 1073741766 |
| 31 | 2147483588 |
| 32 | 4294967234 |
| 33 | 8589934528 |