A350495 - cp's OEIS frontend

A350495 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^2) + 1/x^(k^2))^2.

n	a(n)
0	1
1	2
2	4
3	8
4	16
5	40
6	88
7	222
8	570
9	1564
10	4516
11	13874
12	41866
13	137432
14	442964
15	1492610
16	4998674
17	17204844
18	59175316
19	207299554
20	727137516
21	2582078416
22	9179001124
23	32943918428
24	118453240846
25	428937325964
26	1556421977612
27	5676923326262
28	20754245720206

[1, 2, 4, 8, 16, 40, 88, 222, 570, 1564, 4516, 13874, 41866, 137432, 442964, 1492610, 4998674, 17204844, 59175316, 207299554, 727137516, 2582078416, 9179001124, 32943918428, 118453240846, 428937325964, 1556421977612, 5676923326262, 20754245720206]

cp's OEIS Frontend

A350495 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^2) + 1/x^(k^2))^2.

Table of values

List of values