A164575 - cp's OEIS frontend

A164575 a(n) = n! * [x^n] 2(tan(x))^2(sec(x) + tan(x)).

n	a(n)
0	0
1	0
2	4
3	12
4	56
5	240
6	1324
7	7392
8	49136
9	337920
10	2652244
11	21660672
12	196658216
13	1859020800
14	19192151164
15	206057828352
16	2385488163296
17	28669154426880
18	367966308562084
19	4893320282898432
20	68978503204900376
21	1005520890400604160
22	15445185289163949004
23	244890632417194278912

[0, 0, 4, 12, 56, 240, 1324, 7392, 49136, 337920, 2652244, 21660672, 196658216, 1859020800, 19192151164, 206057828352, 2385488163296, 28669154426880, 367966308562084, 4893320282898432, 68978503204900376, 1005520890400604160, 15445185289163949004, 244890632417194278912]

cp's OEIS Frontend

A164575 a(n) = n! * [x^n] 2(tan(x))^2(sec(x) + tan(x)).

Table of values

List of values

cp's OEIS Frontend

A164575 a(n) = n! * [x^n] 2*(tan(x))^2*(sec(x) + tan(x)).

Table of values

List of values

A164575 a(n) = n! * [x^n] 2(tan(x))^2(sec(x) + tan(x)).