n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 6 |
6 | 16 |
7 | 43 |
8 | 121 |
9 | 365 |
10 | 1155 |
11 | 3832 |
12 | 13274 |
13 | 47862 |
14 | 179084 |
15 | 693589 |
16 | 2774358 |
17 | 11438972 |
18 | 48531450 |
19 | 211543687 |
20 | 946052129 |
21 | 4335355493 |
22 | 20334619731 |
23 | 97521410321 |
24 | 477755388567 |
25 | 2388776942837 |
26 | 12180420245150 |
27 | 63291320166423 |
28 | 334906186618646 |
29 | 1803525009870353 |
[1,0,1,1,3,6,16,43,121,365,1155,3832,13274,47862, 179084,693589,2774358,11438972,48531450,211543687, 946052129,4335355493,20334619731,97521410321, 477755388567,2388776942837,12180420245150, 63291320166423,334906186618646,1803525009870353] |