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 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 30 |
| 6 | 63 |
| 7 | 127 |
| 8 | 190 |
| 9 | 511 |
| 10 | 990 |
| 11 | 1183 |
| 12 | 3582 |
| 13 | 8190 |
| 14 | 16383 |
| 15 | 18590 |
| 16 | 47806 |
| 17 | 131070 |
| 18 | 247967 |
| 19 | 298911 |
| 20 | 854686 |
| 21 | 1453502 |
| 22 | 2423967 |
| 23 | 8362495 |
| 24 | 10366142 |
| 25 | 31738014 |
| 26 | 67100670 |
| 27 | 134217727 |
| 28 | 262073758 |
| 29 | 302254239 |
| 30 | 609175710 |
| 31 | 1779923167 |
| 32 | 3133061822 |
| 33 | 4962151582 |
| 34 | 16855148990 |