A205508 - cp's OEIS frontend

A205508 a(n) = Pell(n) * A004018(n) for n>=1 with a(0)=1, where A004018(n) is the number of ways of writing n as a sum of 2 squares.

n	a(n)
0	1
1	4
2	8
3	0
4	48
5	232
6	0
7	0
8	1632
9	3940
10	19024
11	0
12	0
13	267688
14	0
15	0
16	1883328
17	9093512
18	10976840
19	0
20	127955424
21	0
22	0
23	0
24	0
25	15740857452
26	25334527696
27	0
28	0
29	356483857192
30	0
31	0
32	2508054264192
33	0
34	29236023007504
35	0
36	85200014758320
37	411382062287848
38	0
39	0
40	5788584895037376

[1, 4, 8, 0, 48, 232, 0, 0, 1632, 3940, 19024, 0, 0, 267688, 0, 0, 1883328, 9093512, 10976840, 0, 127955424, 0, 0, 0, 0, 15740857452, 25334527696, 0, 0, 356483857192, 0, 0, 2508054264192, 0, 29236023007504, 0, 85200014758320, 411382062287848, 0, 0, 5788584895037376]

cp's OEIS Frontend

A205508 a(n) = Pell(n) * A004018(n) for n>=1 with a(0)=1, where A004018(n) is the number of ways of writing n as a sum of 2 squares.

Table of values

List of values