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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 20 |
| 6 | 45 |
| 7 | 91 |
| 8 | 168 |
| 9 | 285 |
| 10 | 450 |
| 11 | 670 |
| 12 | 981 |
| 13 | 1375 |
| 14 | 1902 |
| 15 | 2568 |
| 16 | 3371 |
| 17 | 4326 |
| 18 | 5522 |
| 19 | 6927 |
| 20 | 8639 |
| 21 | 10624 |
| 22 | 12882 |
| 23 | 15489 |
| 24 | 18559 |
| 25 | 22006 |
| 26 | 25904 |
| 27 | 30321 |
| 28 | 35254 |
| 29 | 40728 |
| 30 | 46959 |
| 31 | 53721 |
| 32 | 61354 |
| 33 | 69734 |
| 34 | 78917 |
| 35 | 89029 |
| 36 | 100018 |
| 37 | 111758 |
| 38 | 124759 |
| 39 | 138943 |
[0,1,3,8,20,45,91,168,285,450,670,981,1375,1902, 2568,3371,4326,5522,6927,8639,10624,12882,15489, 18559,22006,25904,30321,35254,40728,46959,53721, 61354,69734,78917,89029,100018,111758,124759, 138943] |