A012231 - cp's OEIS frontend

A012231 exp(arctan(arctanh(x)))=1+x+1/2!x^2+1/3!x^3+1/4!x^4+9/5!x^5...

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	9
6	49
7	281
8	1345
9	13233
10	105441
11	1179729
12	10336833
13	144386553
14	1580651409
15	25501409961
16	316289380737
17	5869292202465
18	83559601907649
19	1744083324947745
20	27709107620492673
21	643531258862953065

[1, 1, 1, 1, 1, 9, 49, 281, 1345, 13233, 105441, 1179729, 10336833, 144386553, 1580651409, 25501409961, 316289380737, 5869292202465, 83559601907649, 1744083324947745, 27709107620492673, 643531258862953065]

cp's OEIS Frontend

A012231 exp(arctan(arctanh(x)))=1+x+1/2!x^2+1/3!x^3+1/4!x^4+9/5!x^5...

Table of values

List of values

cp's OEIS Frontend

A012231 exp(arctan(arctanh(x)))=1+x+1/2!*x^2+1/3!*x^3+1/4!*x^4+9/5!*x^5...

Table of values

List of values

A012231 exp(arctan(arctanh(x)))=1+x+1/2!x^2+1/3!x^3+1/4!x^4+9/5!x^5...