The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 12 |
| 7 | 25 |
| 8 | 51 |
| 9 | 101 |
| 10 | 197 |
| 11 | 381 |
| 12 | 731 |
| 13 | 1392 |
| 14 | 2634 |
| 15 | 4958 |
| 16 | 9290 |
| 17 | 17337 |
| 18 | 32239 |
| 19 | 59760 |
| 20 | 110460 |
| 21 | 203651 |
| 22 | 374593 |
| 23 | 687567 |
| 24 | 1259597 |
| 25 | 2303449 |
| 26 | 4205493 |
| 27 | 7666560 |
| 28 | 13956532 |
| 29 | 25374108 |
| 30 | 46076436 |
| 31 | 83575025 |
| 32 | 151431099 |
| 33 | 274108826 |
| 34 | 495708364 |
| 35 | 895670733 |
| 36 | 1617003823 |
| 37 | 2916984121 |
[0,0,0,1,3,6,12,25,51,101,197,381,731,1392,2634, 4958,9290,17337,32239,59760,110460,203651,374593, 687567,1259597,2303449,4205493,7666560,13956532, 25374108,46076436,83575025,151431099,274108826, 495708364,895670733,1617003823,2916984121] |