n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 16 |
4 | 57 |
5 | 192 |
6 | 599 |
7 | 1872 |
8 | 5727 |
9 | 17488 |
10 | 53115 |
11 | 161040 |
12 | 487073 |
13 | 1471680 |
14 | 4441167 |
15 | 13392272 |
16 | 40355877 |
17 | 121543680 |
18 | 365895947 |
19 | 1101089808 |
20 | 3312442185 |
21 | 9962240928 |
22 | 29954639751 |
23 | 90049997136 |
24 | 270661616363 |
25 | 813397065024 |
26 | 2444101696683 |
27 | 7343167947040 |
28 | 22059763982001 |
29 | 66263812628160 |
[0,3,16,57,192,599,1872,5727,17488,53115,161040, 487073,1471680,4441167,13392272,40355877, 121543680,365895947,1101089808,3312442185, 9962240928,29954639751,90049997136,270661616363, 813397065024,2444101696683,7343167947040, 22059763982001,66263812628160] |