n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 12 |
5 | 44 |
6 | 175 |
7 | 718 |
8 | 3052 |
9 | 13308 |
10 | 59139 |
11 | 266974 |
12 | 1220879 |
13 | 5643562 |
14 | 26327769 |
15 | 123793450 |
16 | 586078393 |
17 | 2791408028 |
18 | 13365916545 |
19 | 64302770488 |
20 | 310672722803 |
21 | 1506737267266 |
22 | 7332920012492 |
23 | 35800278685252 |
24 | 175286440178448 |
25 | 860517328379634 |
26 | 4234766396436095 |
[1,1,4,12,44,175,718,3052,13308,59139,266974, 1220879,5643562,26327769,123793450,586078393, 2791408028,13365916545,64302770488,310672722803, 1506737267266,7332920012492,35800278685252, 175286440178448,860517328379634,4234766396436095] |