n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 20 |
3 | 130 |
4 | 1070 |
5 | 10738 |
6 | 127316 |
7 | 1741705 |
8 | 27003335 |
9 | 467906045 |
10 | 8961068424 |
11 | 187959552998 |
12 | 4285257122545 |
13 | 105513858706830 |
14 | 2790444044794960 |
[1,4,20,130,1070,10738,127316,1741705,27003335, 467906045,8961068424,187959552998,4285257122545, 105513858706830,2790444044794960] |