n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 7 |
4 | 18 |
5 | 49 |
6 | 142 |
7 | 438 |
8 | 1405 |
9 | 4630 |
10 | 15595 |
11 | 53493 |
12 | 186112 |
13 | 655421 |
14 | 2331057 |
15 | 8362451 |
16 | 30222369 |
17 | 109930284 |
18 | 402134685 |
19 | 1478480102 |
20 | 5460253675 |
21 | 20247271086 |
22 | 75353895375 |
23 | 281374686795 |
24 | 1053846512655 |
25 | 3957966801068 |
26 | 14902939174394 |
27 | 56245902561309 |
28 | 212741751056939 |
[1,3,7,18,49,142,438,1405,4630,15595,53493,186112, 655421,2331057,8362451,30222369,109930284, 402134685,1478480102,5460253675,20247271086, 75353895375,281374686795,1053846512655, 3957966801068,14902939174394,56245902561309, 212741751056939] |