A012840 - cp's OEIS frontend

A012840 exp(sec(x)arctanh(x))=1+x+1/2!x^2+6/3!x^3+21/4!x^4+120/5!*x^5...

n	a(n)
0	1
1	1
2	1
3	6
4	21
5	120
6	765
7	5376
8	46473
9	415104
10	4371225
11	48143744
12	594635613
13	7784817664
14	110691178325
15	1673986906112
16	27018807872657
17	462531126525952
18	8370279766396593
19	159859054841331712

[1, 1, 1, 6, 21, 120, 765, 5376, 46473, 415104, 4371225, 48143744, 594635613, 7784817664, 110691178325, 1673986906112, 27018807872657, 462531126525952, 8370279766396593, 159859054841331712]

cp's OEIS Frontend

A012840 exp(sec(x)arctanh(x))=1+x+1/2!x^2+6/3!x^3+21/4!x^4+120/5!*x^5...

Table of values

List of values

cp's OEIS Frontend

A012840 exp(sec(x)*arctanh(x))=1+x+1/2!*x^2+6/3!*x^3+21/4!*x^4+120/5!*x^5...

Table of values

List of values

A012840 exp(sec(x)arctanh(x))=1+x+1/2!x^2+6/3!x^3+21/4!x^4+120/5!*x^5...