n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 12 |
4 | 44 |
5 | 116 |
6 | 356 |
7 | 948 |
8 | 2772 |
9 | 7396 |
10 | 20972 |
11 | 56108 |
12 | 156236 |
13 | 418228 |
14 | 1151556 |
15 | 3081180 |
16 | 8421052 |
17 | 22514652 |
18 | 61207972 |
19 | 163518308 |
20 | 442769316 |
21 | 1181982628 |
22 | 3190663628 |
23 | 8511628124 |
24 | 22920057932 |
25 | 61104234356 |
26 | 164212633412 |
[0,0,4,12,44,116,356,948,2772,7396,20972,56108, 156236,418228,1151556,3081180,8421052,22514652, 61207972,163518308,442769316,1181982628, 3190663628,8511628124,22920057932,61104234356, 164212633412] |