n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 20 |
7 | 48 |
8 | 113 |
9 | 275 |
10 | 667 |
11 | 1627 |
12 | 3951 |
13 | 9597 |
14 | 23215 |
15 | 56063 |
16 | 134982 |
17 | 324340 |
18 | 777492 |
19 | 1860365 |
20 | 4442905 |
21 | 10593324 |
22 | 25217480 |
23 | 59944219 |
24 | 142295011 |
25 | 337344737 |
26 | 798769090 |
27 | 1889131816 |
28 | 4462891151 |
29 | 10531873564 |
30 | 24828302752 |
[1,1,1,2,4,9,20,48,113,275,667,1627,3951,9597, 23215,56063,134982,324340,777492,1860365,4442905, 10593324,25217480,59944219,142295011,337344737, 798769090,1889131816,4462891151,10531873564, 24828302752] |