n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 40 |
6 | 238 |
7 | 1760 |
8 | 14076 |
9 | 131732 |
10 | 1308670 |
11 | 14678452 |
12 | 176166906 |
13 | 2317481348 |
14 | 32416648496 |
15 | 490915956484 |
16 | 7846449011500 |
17 | 134291298372632 |
18 | 2416652824505150 |
19 | 46141903780094080 |
20 | 922528719841017424 |
21 | 19456439433050482412 |
22 | 427837767407051523776 |
23 | 9873256397944571377332 |
[0,0,0,2,6,40,238,1760,14076,131732,1308670, 14678452,176166906,2317481348,32416648496, 490915956484,7846449011500,134291298372632, 2416652824505150,46141903780094080, 922528719841017424,19456439433050482412, 427837767407051523776,9873256397944571377332] |