n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 1 |
6 | 2 |
7 | 4 |
8 | 7 |
9 | 13 |
10 | 24 |
11 | 43 |
12 | 78 |
13 | 140 |
14 | 251 |
15 | 452 |
16 | 812 |
17 | 1457 |
18 | 2617 |
19 | 4697 |
20 | 8428 |
21 | 15126 |
22 | 27142 |
23 | 48700 |
24 | 87384 |
25 | 156787 |
26 | 281307 |
27 | 504723 |
28 | 905562 |
29 | 1624731 |
30 | 2915039 |
31 | 5230040 |
32 | 9383505 |
33 | 16835453 |
34 | 30205347 |
35 | 54192931 |
36 | 97230224 |
37 | 174445475 |
38 | 312981054 |
39 | 561534340 |
40 | 1007475560 |
[0,0,0,1,1,2,4,7,13,24,43,78,140,251,452,812,1457, 2617,4697,8428,15126,27142,48700,87384,156787, 281307,504723,905562,1624731,2915039,5230040, 9383505,16835453,30205347,54192931,97230224, 174445475,312981054,561534340,1007475560] |