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A109446 Binomial coefficients C(n,k) with n-k even, read by rows.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 3
5 1
6 1
7 6
8 1
9 5
10 10
11 1
12 1
13 15
14 15
15 1
16 7
17 35
18 21
19 1
20 1
21 28
22 70
23 28
24 1
25 9
26 84
27 126
28 36
29 1
30 1
31 45
32 210
33 210
34 45
35 1
36 11
37 165
38 462
39 330
40 55
41 1
42 1
43 66
44 495
45 924
46 495
47 66
48 1
49 13
50 286
51 1287
52 1716
53 715
54 78
55 1
56 1
57 91
58 1001
59 3003
60 3003
61 1001
62 91
63 1
64 15
65 455
66 3003
67 6435
68 5005

List of values

[1, 1, 1, 1, 3, 1, 1, 6, 1, 5, 10, 1, 1, 15, 15, 1, 7, 35, 21, 1, 1, 28, 70, 28, 1, 9, 84, 126, 36, 1, 1, 45, 210, 210, 45, 1, 11, 165, 462, 330, 55, 1, 1, 66, 495, 924, 495, 66, 1, 13, 286, 1287, 1716, 715, 78, 1, 1, 91, 1001, 3003, 3003, 1001, 91, 1, 15, 455, 3003, 6435, 5005]