The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 9 |
| 6 | 19 |
| 7 | 34 |
| 8 | 69 |
| 9 | 125 |
| 10 | 209 |
| 11 | 461 |
| 12 | 791 |
| 13 | 1715 |
| 14 | 3002 |
| 15 | 5004 |
| 16 | 8007 |
| 17 | 19447 |
| 18 | 31823 |
| 19 | 75581 |
| 20 | 125969 |
| 21 | 203489 |
| 22 | 319769 |
| 23 | 817189 |
| 24 | 1307503 |
| 25 | 2042974 |
| 26 | 3124549 |
| 27 | 4686824 |
| 28 | 6906899 |
| 29 | 20030009 |
| 30 | 30045014 |
| 31 | 84672314 |
| 32 | 129024479 |
| 33 | 193536719 |
| 34 | 286097759 |
| 35 | 417225899 |
| 36 | 600805295 |
[0,0,1,2,5,9,19,34,69,125,209,461,791,1715,3002, 5004,8007,19447,31823,75581,125969,203489,319769, 817189,1307503,2042974,3124549,4686824,6906899, 20030009,30045014,84672314,129024479,193536719, 286097759,417225899,600805295] |