A382740 - cp's OEIS frontend

A382740 Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/2) * (1 / (exp(x) + exp(y) - exp(x+y))^2 - 1).

n	a(n)
1	1
2	1
3	1
4	1
5	7
6	1
7	1
8	19
9	19
10	1
11	1
12	43
13	127
14	43
15	1
16	1
17	91
18	559
19	559
20	91
21	1
22	1
23	187
24	2071
25	4327
26	2071
27	187
28	1
29	1
30	379
31	7039
32	25831
33	25831
34	7039
35	379
36	1
37	1
38	763
39	22807
40	133783
41	233551
42	133783
43	22807
44	763
45	1
46	1
47	1531
48	71839
49	636679
50	1748791
51	1748791
52	636679
53	71839
54	1531
55	1

[1, 1, 1, 1, 7, 1, 1, 19, 19, 1, 1, 43, 127, 43, 1, 1, 91, 559, 559, 91, 1, 1, 187, 2071, 4327, 2071, 187, 1, 1, 379, 7039, 25831, 25831, 7039, 379, 1, 1, 763, 22807, 133783, 233551, 133783, 22807, 763, 1, 1, 1531, 71839, 636679, 1748791, 1748791, 636679, 71839, 1531, 1]

cp's OEIS Frontend

A382740 Square array A(n,k), n >= 1, k >= 1, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] (1/2) * (1 / (exp(x) + exp(y) - exp(x+y))^2 - 1).

Table of values

List of values