A187005 - cp's OEIS frontend

A187005 Triangle, read by rows, where row n equals the coefficients of y^k in R_{n-1}(y+y^2) for k=1..n where R_n(y) is the n-th row polynomial in y for n>1 with R_1(y)=y.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	3
9	6
10	8
11	1
12	4
13	12
14	29
15	50
16	1
17	5
18	20
19	69
20	202
21	436
22	1
23	6
24	30
25	134
26	538
27	1880
28	4912
29	1
30	7
31	42
32	230
33	1164
34	5404
35	22108
36	68098
37	1
38	8
39	56
40	363
41	2210
42	12646
43	67092
44	315784
45	1122952
46	1
47	9
48	72
49	539
50	3830
51	25930
52	166520
53	997581
54	5322126
55	21488640
56	1

[1, 1, 1, 1, 2, 2, 1, 3, 6, 8, 1, 4, 12, 29, 50, 1, 5, 20, 69, 202, 436, 1, 6, 30, 134, 538, 1880, 4912, 1, 7, 42, 230, 1164, 5404, 22108, 68098, 1, 8, 56, 363, 2210, 12646, 67092, 315784, 1122952, 1, 9, 72, 539, 3830, 25930, 166520, 997581, 5322126, 21488640, 1]

cp's OEIS Frontend

A187005 Triangle, read by rows, where row n equals the coefficients of y^k in R_{n-1}(y+y^2) for k=1..n where R_n(y) is the n-th row polynomial in y for n>1 with R_1(y)=y.

Table of values

List of values