A209446 - cp's OEIS frontend

A209446 a(n) = Pell(n)A004016(n) for n >= 1, with a(0)=1, where A004016(n) is the number of integer solutions (x,y) to x^2 + xy + y^2 = n.

n	a(n)
0	1
1	6
2	0
3	30
4	72
5	0
6	0
7	2028
8	0
9	5910
10	0
11	0
12	83160
13	401532
14	0
15	0
16	2824992
17	0
18	0
19	79501308
20	0
21	463367580
22	0
23	0
24	0
25	7870428726
26	0
27	45872220270
28	221490672624
29	0
30	0
31	3116610274188
32	0
33	0
34	0
35	0
36	127800022137480
37	617073093431772
38	0
39	3596565555708780
40	0
41	0
42	0
43	122177355889216668

[1, 6, 0, 30, 72, 0, 0, 2028, 0, 5910, 0, 0, 83160, 401532, 0, 0, 2824992, 0, 0, 79501308, 0, 463367580, 0, 0, 0, 7870428726, 0, 45872220270, 221490672624, 0, 0, 3116610274188, 0, 0, 0, 0, 127800022137480, 617073093431772, 0, 3596565555708780, 0, 0, 0, 122177355889216668]

cp's OEIS Frontend

A209446 a(n) = Pell(n)A004016(n) for n >= 1, with a(0)=1, where A004016(n) is the number of integer solutions (x,y) to x^2 + xy + y^2 = n.

Table of values

List of values

cp's OEIS Frontend

A209446 a(n) = Pell(n)*A004016(n) for n >= 1, with a(0)=1, where A004016(n) is the number of integer solutions (x,y) to x^2 + x*y + y^2 = n.

Table of values

List of values

A209446 a(n) = Pell(n)A004016(n) for n >= 1, with a(0)=1, where A004016(n) is the number of integer solutions (x,y) to x^2 + xy + y^2 = n.