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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 231 |
| 5 | 780 |
| 6 | 1770 |
| 7 | 2850 |
| 8 | 3003 |
| 9 | 4560 |
| 10 | 14028 |
| 11 | 17205 |
| 12 | 20301 |
| 13 | 20706 |
| 14 | 24090 |
| 15 | 24531 |
| 16 | 28203 |
| 17 | 32640 |
| 18 | 37401 |
| 19 | 43071 |
| 20 | 80601 |
| 21 | 96580 |
| 22 | 102831 |
| 23 | 103740 |
| 24 | 112101 |
| 25 | 191890 |
| 26 | 200661 |
| 27 | 201930 |
| 28 | 239086 |
| 29 | 255970 |
| 30 | 286903 |
| 31 | 296065 |
| 32 | 302253 |
| 33 | 303810 |
| 34 | 316410 |
| 35 | 318003 |
| 36 | 332520 |
[0,1,6,231,780,1770,2850,3003,4560,14028,17205, 20301,20706,24090,24531,28203,32640,37401,43071, 80601,96580,102831,103740,112101,191890,200661, 201930,239086,255970,286903,296065,302253,303810, 316410,318003,332520] |