n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 6 |
4 | 21 |
5 | 59 |
6 | 239 |
7 | 760 |
8 | 2970 |
9 | 10060 |
10 | 38930 |
11 | 124735 |
12 | 503767 |
13 | 1986024 |
14 | 7059818 |
15 | 27806989 |
16 | 107739266 |
17 | 376458328 |
18 | 1421570461 |
19 | 5750402871 |
20 | 23095812036 |
21 | 89360066340 |
22 | 315720338715 |
23 | 1202284699132 |
24 | 5133364318360 |
25 | 20343420316531 |
26 | 74430884941912 |
27 | 279471388089807 |
[0,1,4,6,21,59,239,760,2970,10060,38930,124735, 503767,1986024,7059818,27806989,107739266, 376458328,1421570461,5750402871,23095812036, 89360066340,315720338715,1202284699132, 5133364318360,20343420316531,74430884941912, 279471388089807] |