n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 9 |
4 | 32 |
5 | 119 |
6 | 435 |
7 | 1573 |
8 | 5695 |
9 | 20773 |
10 | 76057 |
11 | 279850 |
12 | 1033937 |
13 | 3837070 |
14 | 14296494 |
15 | 53468768 |
16 | 200673056 |
17 | 755606952 |
18 | 2853697709 |
19 | 10807617884 |
20 | 41036410818 |
21 | 156186010430 |
22 | 595759180892 |
23 | 2277112205791 |
24 | 8720036044777 |
25 | 33451314673521 |
26 | 128533154571957 |
[0,2,9,32,119,435,1573,5695,20773,76057,279850, 1033937,3837070,14296494,53468768,200673056, 755606952,2853697709,10807617884,41036410818, 156186010430,595759180892,2277112205791, 8720036044777,33451314673521,128533154571957] |