A012109 - cp's OEIS frontend

A012109 sec(arcsin(sinh(x)))=1+1/2!x^2+13/4!x^4+421/6!x^6+26713/8!x^8...

n	a(n)
0	1
1	1
2	13
3	421
4	26713
5	2794441
6	436186213
7	95033434861
8	27555582190513
9	10260037095841681
10	4771143086720391613
11	2710025439753915534901
12	1846296024220715321941513
13	1486014763274444231870834521

[1, 1, 13, 421, 26713, 2794441, 436186213, 95033434861, 27555582190513, 10260037095841681, 4771143086720391613, 2710025439753915534901, 1846296024220715321941513, 1486014763274444231870834521]

cp's OEIS Frontend

A012109 sec(arcsin(sinh(x)))=1+1/2!x^2+13/4!x^4+421/6!x^6+26713/8!x^8...

Table of values

List of values

cp's OEIS Frontend

A012109 sec(arcsin(sinh(x)))=1+1/2!*x^2+13/4!*x^4+421/6!*x^6+26713/8!*x^8...

Table of values

List of values

A012109 sec(arcsin(sinh(x)))=1+1/2!x^2+13/4!x^4+421/6!x^6+26713/8!x^8...