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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 60 |
| 4 | 372 |
| 5 | 1300 |
| 6 | 4047 |
| 7 | 9800 |
| 8 | 22352 |
| 9 | 44280 |
| 10 | 84575 |
| 11 | 147620 |
| 12 | 251412 |
| 13 | 402220 |
| 14 | 632247 |
| 15 | 949200 |
| 16 | 1406272 |
| 17 | 2011440 |
| 18 | 2847447 |
| 19 | 3920460 |
| 20 | 5353300 |
| 21 | 7147140 |
| 22 | 9477567 |
| 23 | 12336280 |
| 24 | 15966672 |
| 25 | 20345000 |
| 26 | 25800047 |
| 27 | 32284980 |
| 28 | 40234292 |
| 29 | 49568540 |
| 30 | 60851175 |
| 31 | 73958560 |
| 32 | 89609472 |
[0,7,60,372,1300,4047,9800,22352,44280,84575, 147620,251412,402220,632247,949200,1406272, 2011440,2847447,3920460,5353300,7147140,9477567, 12336280,15966672,20345000,25800047,32284980, 40234292,49568540,60851175,73958560,89609472] |