n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 13 |
4 | 42 |
5 | 131 |
6 | 402 |
7 | 1218 |
8 | 3657 |
9 | 10899 |
10 | 32298 |
11 | 95257 |
12 | 279844 |
13 | 819390 |
14 | 2392392 |
15 | 6967956 |
16 | 20250974 |
17 | 58744089 |
18 | 170118980 |
19 | 491913999 |
20 | 1420493862 |
21 | 4096940530 |
22 | 11803172152 |
23 | 33970257473 |
24 | 97678027311 |
25 | 280624328431 |
26 | 805587723862 |
[0,1,4,13,42,131,402,1218,3657,10899,32298,95257, 279844,819390,2392392,6967956,20250974,58744089, 170118980,491913999,1420493862,4096940530, 11803172152,33970257473,97678027311,280624328431, 805587723862] |