n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 21 |
6 | 56 |
7 | 164 |
8 | 533 |
9 | 1818 |
10 | 6473 |
11 | 23546 |
12 | 87146 |
13 | 325737 |
14 | 1227708 |
15 | 4654284 |
16 | 17733539 |
17 | 67841448 |
18 | 260463500 |
19 | 1003087732 |
20 | 3873759682 |
21 | 14996820360 |
22 | 58188678048 |
23 | 226235685776 |
24 | 881235386179 |
25 | 3438462430943 |
26 | 13437551253018 |
[1,2,4,9,21,56,164,533,1818,6473,23546,87146, 325737,1227708,4654284,17733539,67841448, 260463500,1003087732,3873759682,14996820360, 58188678048,226235685776,881235386179, 3438462430943,13437551253018] |