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 | 0 |
| 1 | 0 |
| 2 | -1 |
| 3 | -1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 2 |
| 7 | 6 |
| 8 | 13 |
| 9 | 25 |
| 10 | 45 |
| 11 | 78 |
| 12 | 132 |
| 13 | 220 |
| 14 | 363 |
| 15 | 595 |
| 16 | 971 |
| 17 | 1580 |
| 18 | 2566 |
| 19 | 4162 |
| 20 | 6745 |
| 21 | 10925 |
| 22 | 17689 |
| 23 | 28634 |
| 24 | 46344 |
| 25 | 75000 |
| 26 | 121367 |
| 27 | 196391 |
| 28 | 317783 |
| 29 | 514200 |
| 30 | 832010 |
| 31 | 1346238 |
| 32 | 2178277 |
| 33 | 3524545 |
| 34 | 5702853 |
| 35 | 9227430 |
| 36 | 14930316 |
| 37 | 24157780 |
| 38 | 39088131 |
| 39 | 63245947 |
| 40 | 102334115 |
| 41 | 165580100 |
| 42 | 267914254 |