A146986 - cp's OEIS frontend

A146986 Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 2^(n-1) * binomial(n-2, k-1) otherwise.

n	a(n)
0	1
1	1
2	1
3	1
4	4
5	1
6	1
7	7
8	7
9	1
10	1
11	12
12	22
13	12
14	1
15	1
16	21
17	58
18	58
19	21
20	1
21	1
22	38
23	143
24	212
25	143
26	38
27	1
28	1
29	71
30	341
31	675
32	675
33	341
34	71
35	1
36	1
37	136
38	796
39	1976
40	2630
41	1976
42	796
43	136
44	1
45	1
46	265
47	1828
48	5460
49	9086
50	9086
51	5460
52	1828
53	265
54	1
55	1
56	522
57	4141
58	14456
59	28882
60	36092
61	28882
62	14456
63	4141
64	522
65	1

[1, 1, 1, 1, 4, 1, 1, 7, 7, 1, 1, 12, 22, 12, 1, 1, 21, 58, 58, 21, 1, 1, 38, 143, 212, 143, 38, 1, 1, 71, 341, 675, 675, 341, 71, 1, 1, 136, 796, 1976, 2630, 1976, 796, 136, 1, 1, 265, 1828, 5460, 9086, 9086, 5460, 1828, 265, 1, 1, 522, 4141, 14456, 28882, 36092, 28882, 14456, 4141, 522, 1]

cp's OEIS Frontend

A146986 Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 2^(n-1) * binomial(n-2, k-1) otherwise.

Table of values

List of values