n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 21 |
3 | 127 |
4 | 835 |
5 | 5798 |
6 | 41835 |
7 | 310572 |
8 | 2356779 |
9 | 18199284 |
10 | 142547559 |
11 | 1129760415 |
12 | 9043402501 |
13 | 73007772802 |
14 | 593742784829 |
15 | 4859761676391 |
16 | 40002464776083 |
17 | 330931069469828 |
18 | 2750016719520991 |
19 | 22944749046030949 |
20 | 192137918101841817 |
21 | 1614282136160911722 |
[1,4,21,127,835,5798,41835,310572,2356779, 18199284,142547559,1129760415,9043402501, 73007772802,593742784829,4859761676391, 40002464776083,330931069469828,2750016719520991, 22944749046030949,192137918101841817, 1614282136160911722] |