n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 2 |
5 | 7 |
6 | 18 |
7 | 42 |
8 | 84 |
9 | 153 |
10 | 264 |
11 | 429 |
12 | 666 |
13 | 1001 |
14 | 1456 |
15 | 2061 |
16 | 2856 |
17 | 3876 |
18 | 5166 |
19 | 6783 |
20 | 8778 |
21 | 11214 |
22 | 14168 |
23 | 17710 |
24 | 21924 |
25 | 26910 |
26 | 32760 |
27 | 39582 |
28 | 47502 |
29 | 56637 |
30 | 67122 |
31 | 79112 |
32 | 92752 |
33 | 108207 |
34 | 125664 |
35 | 145299 |
36 | 167310 |
37 | 191919 |
38 | 219336 |
39 | 249795 |
40 | 283556 |
[0,0,0,0,2,7,18,42,84,153,264,429,666,1001,1456, 2061,2856,3876,5166,6783,8778,11214,14168,17710, 21924,26910,32760,39582,47502,56637,67122,79112, 92752,108207,125664,145299,167310,191919,219336, 249795,283556] |