n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 16 |
6 | 39 |
7 | 105 |
8 | 314 |
9 | 1035 |
10 | 3723 |
11 | 14494 |
12 | 60670 |
13 | 271544 |
14 | 1293147 |
15 | 6523495 |
16 | 34724247 |
17 | 194357190 |
18 | 1140402612 |
19 | 6995760364 |
20 | 44760085240 |
21 | 298054873358 |
22 | 2061644525813 |
23 | 14787185811993 |
24 | 109804829195145 |
25 | 842928183558160 |
26 | 6680572760715182 |
27 | 54595535222727960 |
[0,1,3,7,16,39,105,314,1035,3723,14494,60670, 271544,1293147,6523495,34724247,194357190, 1140402612,6995760364,44760085240,298054873358, 2061644525813,14787185811993,109804829195145, 842928183558160,6680572760715182, 54595535222727960] |