n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 150 |
4 | 738 |
5 | 3570 |
6 | 17118 |
7 | 81498 |
8 | 385710 |
9 | 1817046 |
10 | 8528478 |
11 | 39903462 |
12 | 186198642 |
13 | 866861394 |
14 | 4027766490 |
15 | 18681900270 |
16 | 86518735722 |
17 | 400136695074 |
18 | 1848320799438 |
19 | 8528448008214 |
[1,6,30,150,738,3570,17118,81498,385710,1817046, 8528478,39903462,186198642,866861394,4027766490, 18681900270,86518735722,400136695074, 1848320799438,8528448008214] |