n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 3 |
3 | 27 |
4 | 126 |
5 | 462 |
6 | 1521 |
7 | 4761 |
8 | 14556 |
9 | 44028 |
10 | 132543 |
11 | 398199 |
12 | 1195290 |
13 | 3586698 |
14 | 10761069 |
15 | 32284341 |
16 | 96854328 |
17 | 290564472 |
18 | 871695099 |
19 | 2615087187 |
20 | 7845263670 |
21 | 23535793350 |
22 | 70607382633 |
23 | 211822150737 |
24 | 635466455316 |
25 | 1906399369332 |
26 | 5719198111671 |
27 | 17157594338991 |
[0,0,3,27,126,462,1521,4761,14556,44028,132543, 398199,1195290,3586698,10761069,32284341,96854328, 290564472,871695099,2615087187,7845263670, 23535793350,70607382633,211822150737,635466455316, 1906399369332,5719198111671,17157594338991] |