A371688 - cp's OEIS frontend

A371688 Triangle read by rows: T(n, k) = (2n + 1)! [y^(2k)] [x^(2n+1)] arctan(sec(xy)sinh(x)).

n	a(n)
0	1
1	-1
2	3
3	5
4	-50
5	25
6	-61
7	1281
8	-2135
9	427
10	1385
11	-49860
12	174510
13	-116340
14	12465
15	-50521
16	2778655
17	-16671930
18	23340702
19	-8335965
20	555731
21	2702765
22	-210815670
23	1932476975
24	-4637944740
25	3478458555
26	-772990790
27	35135945

[1, -1, 3, 5, -50, 25, -61, 1281, -2135, 427, 1385, -49860, 174510, -116340, 12465, -50521, 2778655, -16671930, 23340702, -8335965, 555731, 2702765, -210815670, 1932476975, -4637944740, 3478458555, -772990790, 35135945]

cp's OEIS Frontend

A371688 Triangle read by rows: T(n, k) = (2n + 1)! [y^(2k)] [x^(2n+1)] arctan(sec(xy)sinh(x)).

Table of values

List of values

cp's OEIS Frontend

A371688 Triangle read by rows: T(n, k) = (2*n + 1)! * [y^(2*k)] [x^(2*n+1)] arctan(sec(x*y)*sinh(x)).

Table of values

List of values

A371688 Triangle read by rows: T(n, k) = (2n + 1)! [y^(2k)] [x^(2n+1)] arctan(sec(xy)sinh(x)).