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A261356 Pyramid of coefficients in expansion of (1+x+2*y)^n.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 1
5 2
6 4
7 1
8 4
9 4
10 1
11 3
12 6
13 3
14 12
15 12
16 1
17 6
18 12
19 8
20 1
21 4
22 8
23 6
24 24
25 24
26 4
27 24
28 48
29 32
30 1
31 8
32 24
33 32
34 16
35 1
36 5
37 10
38 10
39 40
40 40
41 10
42 60
43 120
44 80
45 5
46 40
47 120
48 160
49 80
50 1
51 10
52 40
53 80
54 80
55 32
56 1
57 6
58 12
59 15
60 60
61 60
62 20
63 120
64 240
65 160
66 15
67 120
68 360
69 480

List of values

[1, 1, 1, 2, 1, 2, 4, 1, 4, 4, 1, 3, 6, 3, 12, 12, 1, 6, 12, 8, 1, 4, 8, 6, 24, 24, 4, 24, 48, 32, 1, 8, 24, 32, 16, 1, 5, 10, 10, 40, 40, 10, 60, 120, 80, 5, 40, 120, 160, 80, 1, 10, 40, 80, 80, 32, 1, 6, 12, 15, 60, 60, 20, 120, 240, 160, 15, 120, 360, 480]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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