The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 6 |
| 10 | 10 |
| 11 | 16 |
| 12 | 28 |
| 13 | 48 |
| 14 | 83 |
| 15 | 145 |
| 16 | 256 |
| 17 | 453 |
| 18 | 809 |
| 19 | 1452 |
| 20 | 2621 |
| 21 | 4755 |
| 22 | 8665 |
| 23 | 15857 |
| 24 | 29127 |
| 25 | 53687 |
| 26 | 99273 |
| 27 | 184112 |
| 28 | 342392 |
| 29 | 638372 |
| 30 | 1193046 |
| 31 | 2234634 |
| 32 | 4194304 |
| 33 | 7887910 |
| 34 | 14861478 |
| 35 | 28048766 |
| 36 | 53024287 |
| 37 | 100393684 |
| 38 | 190358661 |
| 39 | 361443664 |
[2,1,0,1,1,1,2,4,6,10,16,28,48,83,145,256,453,809, 1452,2621,4755,8665,15857,29127,53687,99273, 184112,342392,638372,1193046,2234634,4194304, 7887910,14861478,28048766,53024287,100393684, 190358661,361443664] |