n | a(n) |
---|---|
0 | 6 |
1 | 30 |
2 | 140 |
3 | 631 |
4 | 2786 |
5 | 12136 |
6 | 52368 |
7 | 224406 |
8 | 956516 |
9 | 4060038 |
10 | 17175132 |
11 | 72454075 |
12 | 304941386 |
13 | 1280898304 |
14 | 5371301504 |
15 | 22491017758 |
16 | 94055344244 |
17 | 392888085100 |
18 | 1639534704632 |
19 | 6835739258998 |
20 | 28477594607348 |
21 | 118551827347576 |
[6,30,140,631,2786,12136,52368,224406,956516, 4060038,17175132,72454075,304941386,1280898304, 5371301504,22491017758,94055344244,392888085100, 1639534704632,6835739258998,28477594607348, 118551827347576] |