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 | 4 |
| 3 | 9 |
| 4 | 22 |
| 5 | 55 |
| 6 | 136 |
| 7 | 329 |
| 8 | 778 |
| 9 | 1803 |
| 10 | 4108 |
| 11 | 9229 |
| 12 | 20494 |
| 13 | 45071 |
| 14 | 98320 |
| 15 | 213009 |
| 16 | 458770 |
| 17 | 983059 |
| 18 | 2097172 |
| 19 | 4456469 |
| 20 | 9437206 |
| 21 | 19922967 |
| 22 | 41943064 |
| 23 | 88080409 |
| 24 | 184549402 |
| 25 | 385875995 |
| 26 | 805306396 |
| 27 | 1677721629 |
| 28 | 3489660958 |
| 29 | 7247757343 |
| 30 | 15032385568 |
| 31 | 31138512929 |
| 32 | 64424509474 |