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 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 35 |
| 6 | 78 |
| 7 | 133 |
| 8 | 280 |
| 9 | 531 |
| 10 | 1070 |
| 11 | 2057 |
| 12 | 4212 |
| 13 | 8203 |
| 14 | 16534 |
| 15 | 32865 |
| 16 | 65840 |
| 17 | 131087 |
| 18 | 262818 |
| 19 | 524305 |
| 20 | 1049740 |
| 21 | 2097459 |
| 22 | 4196390 |
| 23 | 8388629 |
| 24 | 16782024 |
| 25 | 33554575 |
| 26 | 67117102 |
| 27 | 134218809 |
| 28 | 268452212 |
| 29 | 536870939 |
| 30 | 1073777010 |
| 31 | 2147483677 |
| 32 | 4295033440 |
| 33 | 8589938775 |
| 34 | 17180000318 |
| 35 | 34359739085 |