A261056 - cp's OEIS frontend

A261056 Expansion of ( 2-x^2 ) / (x^2+2*x-1)^2 .

n	a(n)
0	2
1	8
2	27
3	84
4	248
5	708
6	1973
7	5400
8	14574
9	38896
10	102863
11	269964
12	703972
13	1825612
14	4711785
15	12110064
16	31010266
17	79148184
18	201420163
19	511233156
20	1294489296
21	3270662036
22	8247316765
23	20758752648
24	52163239622
25	130875524096
26	327893289783
27	820410399804
28	2050189683644

[2, 8, 27, 84, 248, 708, 1973, 5400, 14574, 38896, 102863, 269964, 703972, 1825612, 4711785, 12110064, 31010266, 79148184, 201420163, 511233156, 1294489296, 3270662036, 8247316765, 20758752648, 52163239622, 130875524096, 327893289783, 820410399804, 2050189683644]

cp's OEIS Frontend

A261056 Expansion of ( 2-x^2 ) / (x^2+2*x-1)^2 .

Table of values

List of values