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 | 11 |
| 4 | 27 |
| 5 | 63 |
| 6 | 142 |
| 7 | 314 |
| 8 | 684 |
| 9 | 1474 |
| 10 | 3150 |
| 11 | 6685 |
| 12 | 14110 |
| 13 | 29640 |
| 14 | 62022 |
| 15 | 129337 |
| 16 | 268930 |
| 17 | 557752 |
| 18 | 1154164 |
| 19 | 2383587 |
| 20 | 4913835 |
| 21 | 10113983 |
| 22 | 20787252 |
| 23 | 42668775 |
| 24 | 87479539 |
| 25 | 179157497 |
| 26 | 366547820 |
| 27 | 749256450 |
| 28 | 1530251194 |
| 29 | 3122882776 |
| 30 | 6368433118 |
| 31 | 12978230568 |
| 32 | 26431617730 |
| 33 | 53799078716 |
| 34 | 109442256914 |
| 35 | 222519713892 |
| 36 | 452208698216 |
| 37 | 918560947022 |
| 38 | 1865036287632 |
| 39 | 3785181059505 |
| 40 | 7679199158098 |