A339513 - cp's OEIS frontend

A339513 Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)2x/(1+x^2))'; then a(n)=R_{n}(1).

n	a(n)
1	1
2	0
3	-1
4	3
5	-2
6	-45
7	347
8	-756
9	-13031
10	184245
11	-810034
12	-11404503
13	264733177
14	-1931955480
15	-21453955777
16	796153961091
17	-8688345850874
18	-69492467459925
19	4300450718587619
20	-65896562313762012
21	-307002797419794407
22	37668399518087366325

[1, 0, -1, 3, -2, -45, 347, -756, -13031, 184245, -810034, -11404503, 264733177, -1931955480, -21453955777, 796153961091, -8688345850874, -69492467459925, 4300450718587619, -65896562313762012, -307002797419794407, 37668399518087366325]

cp's OEIS Frontend

A339513 Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)2x/(1+x^2))'; then a(n)=R_{n}(1).

Table of values

List of values

cp's OEIS Frontend

A339513 Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)*2*x/(1+x^2))'; then a(n)=R_{n}(1).

Table of values

List of values

A339513 Define R_{1}(x)=1, R_{n+1}(x)=(R_n(x)2x/(1+x^2))'; then a(n)=R_{n}(1).