A221971 - cp's OEIS frontend

A221971 G.f.: A(x,y) = Sum_{n>=0} n! * x^ny^n Product_{k=1..n} (1 + kx) / (1 + kx*y + k^2x^2y).

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	1
6	0
7	0
8	4
9	1
10	0
11	0
12	3
13	11
14	1
15	0
16	0
17	0
18	27
19	26
20	1
21	0
22	0
23	0
24	17
25	148
26	57
27	1
28	0
29	0
30	0
31	0
32	278
33	646
34	120
35	1
36	0
37	0
38	0
39	0
40	155
41	2590
42	2481
43	247
44	1
45	0
46	0
47	0
48	0
49	0
50	4073
51	18304
52	8805
53	502
54	1
55	0
56	0
57	0
58	0
59	0
60	2073
61	58427
62	109699
63	29682
64	1013
65	1
66	0
67	0
68	0

[1, 0, 1, 0, 1, 1, 0, 0, 4, 1, 0, 0, 3, 11, 1, 0, 0, 0, 27, 26, 1, 0, 0, 0, 17, 148, 57, 1, 0, 0, 0, 0, 278, 646, 120, 1, 0, 0, 0, 0, 155, 2590, 2481, 247, 1, 0, 0, 0, 0, 0, 4073, 18304, 8805, 502, 1, 0, 0, 0, 0, 0, 2073, 58427, 109699, 29682, 1013, 1, 0, 0, 0]

cp's OEIS Frontend

A221971 G.f.: A(x,y) = Sum_{n>=0} n! * x^ny^n Product_{k=1..n} (1 + kx) / (1 + kx*y + k^2x^2y).

Table of values

List of values

cp's OEIS Frontend

A221971 G.f.: A(x,y) = Sum_{n>=0} n! * x^n*y^n * Product_{k=1..n} (1 + k*x) / (1 + k*x*y + k^2*x^2*y).

Table of values

List of values

A221971 G.f.: A(x,y) = Sum_{n>=0} n! * x^ny^n Product_{k=1..n} (1 + kx) / (1 + kx*y + k^2x^2y).