n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 18 |
3 | 97 |
4 | 564 |
5 | 3512 |
6 | 23000 |
7 | 155611 |
8 | 1077871 |
9 | 7603553 |
10 | 54400028 |
11 | 393615806 |
12 | 2874398515 |
13 | 21151907950 |
14 | 156661034233 |
15 | 1166746786182 |
16 | 8731188863470 |
17 | 65612899915304 |
18 | 494890204904784 |
19 | 3745011184713964 |
20 | 28423094496953330 |
21 | 216289611853439384 |
22 | 1649819700464785589 |
[0,4,18,97,564,3512,23000,155611,1077871,7603553, 54400028,393615806,2874398515,21151907950, 156661034233,1166746786182,8731188863470, 65612899915304,494890204904784,3745011184713964, 28423094496953330,216289611853439384, 1649819700464785589] |