A369089 - cp's OEIS frontend

A369089 Expansion of Sum_{n>=0} ( (1+x)^n/(1-x)^n + (1-x)^n/(1+x)^n )^n / 4^n, listing the coefficients of only the even powers of x.

n	a(n)
0	2
1	52
2	17324
3	16145844
4	29572623276
5	89637821913140
6	406104654882450092
7	2570553924485112780724
8	21667036447652685648382124
9	234610018567852042809723552820
10	3173541919429028069213132538924460
11	52444911598298125255750037883777795508
12	1039685774587940760247676247641790182818220

[2, 52, 17324, 16145844, 29572623276, 89637821913140, 406104654882450092, 2570553924485112780724, 21667036447652685648382124, 234610018567852042809723552820, 3173541919429028069213132538924460, 52444911598298125255750037883777795508, 1039685774587940760247676247641790182818220]

cp's OEIS Frontend

A369089 Expansion of Sum_{n>=0} ( (1+x)^n/(1-x)^n + (1-x)^n/(1+x)^n )^n / 4^n, listing the coefficients of only the even powers of x.

Table of values

List of values