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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 6 |
| 6 | 13 |
| 7 | 30 |
| 8 | 61 |
| 9 | 121 |
| 10 | 210 |
| 11 | 353 |
| 12 | 600 |
| 13 | 989 |
| 14 | 1628 |
| 15 | 2667 |
| 16 | 4205 |
| 17 | 6514 |
| 18 | 10406 |
| 19 | 15893 |
| 20 | 24322 |
| 21 | 37516 |
| 22 | 56824 |
| 23 | 85102 |
| 24 | 128420 |
| 25 | 191579 |
| 26 | 284898 |
| 27 | 422839 |
| 28 | 622721 |
| 29 | 913006 |
| 30 | 1345320 |
| 31 | 1958269 |
| 32 | 2843788 |
| 33 | 4140170 |
| 34 | 5983662 |
| 35 | 8632808 |
| 36 | 12433730 |
| 37 | 17830728 |
| 38 | 25527909 |
| 39 | 36516161 |
[0,0,0,3,6,13,30,61,121,210,353,600,989,1628,2667, 4205,6514,10406,15893,24322,37516,56824,85102, 128420,191579,284898,422839,622721,913006,1345320, 1958269,2843788,4140170,5983662,8632808,12433730, 17830728,25527909,36516161] |