A209456 - cp's OEIS frontend

A209456 a(n) = Pell(n)A028594(n) for n>=1, with a(0)=1, where A028594 lists the coefficients in (theta_3(x)theta_3(7x)+theta_2(x)theta_2(7*x))^2.

n	a(n)
0	1
1	4
2	24
3	80
4	336
5	696
6	3360
7	676
8	24480
9	51220
10	171216
11	275568
12	1552320
13	1873816
14	969384
15	18722400
16	58383168
17	81841608
18	428096760
19	530008720
20	2687063904
21	617823440
22	13424019552
23	21605633376
24	130401532800
25	162655527004
26	532025081616
27	1223259207200

[1, 4, 24, 80, 336, 696, 3360, 676, 24480, 51220, 171216, 275568, 1552320, 1873816, 969384, 18722400, 58383168, 81841608, 428096760, 530008720, 2687063904, 617823440, 13424019552, 21605633376, 130401532800, 162655527004, 532025081616, 1223259207200]

cp's OEIS Frontend

A209456 a(n) = Pell(n)A028594(n) for n>=1, with a(0)=1, where A028594 lists the coefficients in (theta_3(x)theta_3(7x)+theta_2(x)theta_2(7*x))^2.

Table of values

List of values

cp's OEIS Frontend

A209456 a(n) = Pell(n)*A028594(n) for n>=1, with a(0)=1, where A028594 lists the coefficients in (theta_3(x)*theta_3(7*x)+theta_2(x)*theta_2(7*x))^2.

Table of values

List of values

A209456 a(n) = Pell(n)A028594(n) for n>=1, with a(0)=1, where A028594 lists the coefficients in (theta_3(x)theta_3(7x)+theta_2(x)theta_2(7*x))^2.