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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 3 |
| 3 | 10 |
| 4 | 31 |
| 5 | 70 |
| 6 | 153 |
| 7 | 268 |
| 8 | 469 |
| 9 | 746 |
| 10 | 1153 |
| 11 | 1648 |
| 12 | 2361 |
| 13 | 3230 |
| 14 | 4415 |
| 15 | 5784 |
| 16 | 7473 |
| 17 | 9450 |
| 18 | 11963 |
| 19 | 14772 |
| 20 | 18255 |
| 21 | 22194 |
| 22 | 26793 |
| 23 | 31824 |
| 24 | 37837 |
| 25 | 44474 |
| 26 | 52187 |
| 27 | 60516 |
| 28 | 69983 |
| 29 | 80318 |
| 30 | 92233 |
| 31 | 104972 |
| 32 | 119525 |
| 33 | 135294 |
| 34 | 152739 |
| 35 | 171240 |
| 36 | 191685 |
| 37 | 213510 |
| 38 | 237915 |
| 39 | 263640 |
[0,0,3,10,31,70,153,268,469,746,1153,1648,2361, 3230,4415,5784,7473,9450,11963,14772,18255,22194, 26793,31824,37837,44474,52187,60516,69983,80318, 92233,104972,119525,135294,152739,171240,191685, 213510,237915,263640] |