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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 28 |
| 7 | 51 |
| 8 | 91 |
| 9 | 156 |
| 10 | 260 |
| 11 | 425 |
| 12 | 680 |
| 13 | 1068 |
| 14 | 1654 |
| 15 | 2524 |
| 16 | 3802 |
| 17 | 5668 |
| 18 | 8350 |
| 19 | 12190 |
| 20 | 17634 |
| 21 | 25306 |
| 22 | 36011 |
| 23 | 50902 |
| 24 | 71441 |
| 25 | 99642 |
[0,0,1,3,7,14,28,51,91,156,260,425,680,1068,1654, 2524,3802,5668,8350,12190,17634,25306,36011,50902, 71441,99642] |