n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 37 |
7 | 138 |
8 | 628 |
9 | 2972 |
10 | 14903 |
11 | 76994 |
12 | 409594 |
13 | 2222628 |
14 | 12281570 |
15 | 68864086 |
16 | 391120036 |
17 | 2246122574 |
18 | 13025721601 |
19 | 76194378042 |
20 | 449155863868 |
21 | 2666126033850 |
22 | 15925105028685 |
23 | 95664343622234 |
24 | 577651490729530 |
[2,1,2,4,10,37,138,628,2972,14903,76994,409594, 2222628,12281570,68864086,391120036,2246122574, 13025721601,76194378042,449155863868, 2666126033850,15925105028685,95664343622234, 577651490729530] |