A369388 - cp's OEIS frontend

A369388 a(n) is the constant term in expansion of Product_{k=1..n} (x^prime(k) + 1 + 1/x^prime(k))^2.

n	a(n)
0	1
1	3
2	9
3	45
4	249
5	1373
6	9177
7	62257
8	453179
9	3320531
10	24087877
11	183643865
12	1394580343
13	10794949627
14	85730722969
15	686171829489
16	5487361175591
17	43981108061647
18	358362244544957
19	2922625435214613
20	24006575088945973
21	199229783030494775
22	1653790732247194785

[1, 3, 9, 45, 249, 1373, 9177, 62257, 453179, 3320531, 24087877, 183643865, 1394580343, 10794949627, 85730722969, 686171829489, 5487361175591, 43981108061647, 358362244544957, 2922625435214613, 24006575088945973, 199229783030494775, 1653790732247194785]

cp's OEIS Frontend

A369388 a(n) is the constant term in expansion of Product_{k=1..n} (x^prime(k) + 1 + 1/x^prime(k))^2.

Table of values

List of values