n | a(n) |
---|---|
1 | 2 |
2 | 7 |
3 | 28 |
4 | 137 |
5 | 735 |
6 | 4074 |
7 | 22128 |
8 | 113677 |
9 | 544142 |
10 | 2417707 |
11 | 9991874 |
12 | 38585111 |
13 | 139969744 |
14 | 479482160 |
15 | 1558677189 |
16 | 4829461991 |
17 | 14318767180 |
18 | 40765225229 |
19 | 111787710303 |
20 | 296081929163 |
21 | 759290568963 |
22 | 1889449601320 |
23 | 4571408444209 |
[2,7,28,137,735,4074,22128,113677,544142,2417707, 9991874,38585111,139969744,479482160,1558677189, 4829461991,14318767180,40765225229,111787710303, 296081929163,759290568963,1889449601320, 4571408444209] |