n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 6 |
4 | 15 |
5 | 39 |
6 | 117 |
7 | 359 |
8 | 1149 |
9 | 3780 |
10 | 12752 |
11 | 43740 |
12 | 152346 |
13 | 536655 |
14 | 1909411 |
15 | 6852153 |
16 | 24772328 |
17 | 90137210 |
18 | 329838392 |
19 | 1213048022 |
20 | 4481262944 |
21 | 16621500330 |
22 | 61875433940 |
23 | 231099456721 |
24 | 865736972546 |
25 | 3252139562356 |
26 | 12247622197965 |
27 | 46232602224402 |
28 | 174897265479074 |
[1,3,6,15,39,117,359,1149,3780,12752,43740,152346, 536655,1909411,6852153,24772328,90137210, 329838392,1213048022,4481262944,16621500330, 61875433940,231099456721,865736972546, 3252139562356,12247622197965,46232602224402, 174897265479074] |