A321394 - cp's OEIS frontend

A321394 a(n) = (1/24)n![x^n] (9 + sectan(4x) + 6sectan(2x) + 8sectan(x)) where sectan(x) = sec(x) + tan(x).

n	a(n)
0	1
1	1
2	2
3	10
4	75
5	816
6	11407
7	194480
8	3871075
9	87700736
10	2220246387
11	62010892800
12	1892138207375
13	62591994720256
14	2230631475837767
15	85188256574494720
16	3470563987113896475
17	150234341045137637376
18	6886077311552162511547
19	333165973379285030666240
20	16967906593223743786978375

[1, 1, 2, 10, 75, 816, 11407, 194480, 3871075, 87700736, 2220246387, 62010892800, 1892138207375, 62591994720256, 2230631475837767, 85188256574494720, 3470563987113896475, 150234341045137637376, 6886077311552162511547, 333165973379285030666240, 16967906593223743786978375]

cp's OEIS Frontend

A321394 a(n) = (1/24)n![x^n] (9 + sectan(4x) + 6sectan(2x) + 8sectan(x)) where sectan(x) = sec(x) + tan(x).

Table of values

List of values

cp's OEIS Frontend

A321394 a(n) = (1/24)*n!*[x^n] (9 + sectan(4*x) + 6*sectan(2*x) + 8*sectan(x)) where sectan(x) = sec(x) + tan(x).

Table of values

List of values

A321394 a(n) = (1/24)n![x^n] (9 + sectan(4x) + 6sectan(2x) + 8sectan(x)) where sectan(x) = sec(x) + tan(x).