A341576 - cp's OEIS frontend

A341576 a(n) = Sum_{k=0..n} U_k((n-k)/2) where U_n(x) is a Chebyshev polynomial of the 2nd kind.

n	a(n)
0	1
1	1
2	1
3	3
4	7
5	16
6	46
7	149
8	520
9	1977
10	8136
11	35878
12	168501
13	838945
14	4409957
15	24385913
16	141412615
17	857611640
18	5426144190
19	35739397739
20	244573978100
21	1735854397529
22	12757309001220
23	96941738970956
24	760649367654461
25	6155205917196409
26	51308394497243469

[1, 1, 1, 3, 7, 16, 46, 149, 520, 1977, 8136, 35878, 168501, 838945, 4409957, 24385913, 141412615, 857611640, 5426144190, 35739397739, 244573978100, 1735854397529, 12757309001220, 96941738970956, 760649367654461, 6155205917196409, 51308394497243469]

cp's OEIS Frontend

A341576 a(n) = Sum_{k=0..n} U_k((n-k)/2) where U_n(x) is a Chebyshev polynomial of the 2nd kind.

Table of values

List of values