n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 21 |
3 | 72 |
4 | 225 |
5 | 702 |
6 | 2133 |
7 | 6480 |
8 | 19521 |
9 | 58806 |
10 | 176661 |
11 | 530712 |
12 | 1592865 |
13 | 4780782 |
14 | 14344533 |
15 | 43040160 |
16 | 129127041 |
17 | 387400806 |
18 | 1162222101 |
19 | 3486725352 |
20 | 10460235105 |
21 | 31380882462 |
22 | 94142824533 |
23 | 282429005040 |
24 | 847287546561 |
[1,6,21,72,225,702,2133,6480,19521,58806,176661, 530712,1592865,4780782,14344533,43040160, 129127041,387400806,1162222101,3486725352, 10460235105,31380882462,94142824533,282429005040, 847287546561] |