A166890 - cp's OEIS frontend

A166890 Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x*(1+x)^2 (cf. A166888).

n	a(n)
1	1
2	2
3	1
4	9
5	4
6	1
7	78
8	30
9	6
10	1
11	1038
12	364
13	63
14	8
15	1
16	18968
17	6233
18	986
19	108
20	10
21	1
22	443595
23	139008
24	20685
25	2072
26	165
27	12
28	1
29	12681960
30	3833052
31	545736
32	51494
33	3750
34	234
35	14
36	1
37	429244197
38	126105168
39	17365336
40	1569920
41	107760
42	6148
43	315
44	16
45	1
46	16801151910

[1, 2, 1, 9, 4, 1, 78, 30, 6, 1, 1038, 364, 63, 8, 1, 18968, 6233, 986, 108, 10, 1, 443595, 139008, 20685, 2072, 165, 12, 1, 12681960, 3833052, 545736, 51494, 3750, 234, 14, 1, 429244197, 126105168, 17365336, 1569920, 107760, 6148, 315, 16, 1, 16801151910]

cp's OEIS Frontend

A166890 Triangle, read by rows, that transforms diagonals in the table of coefficients of successive iterations of x*(1+x)^2 (cf. A166888).

Table of values

List of values