A205507 - cp's OEIS frontend

A205507 a(n) = Fibonacci(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	4
3	0
4	12
5	40
6	0
7	0
8	84
9	136
10	440
11	0
12	0
13	1864
14	0
15	0
16	3948
17	12776
18	10336
19	0
20	54120
21	0
22	0
23	0
24	0
25	900300
26	971144
27	0
28	0
29	4113832
30	0
31	0
32	8713236
33	0
34	45623096
35	0
36	59721408
37	193262536
38	0
39	0
40	818673240
41	1324641128
42	0
43	0
44	0
45	9079225360
46	0
47	0
48	0
49	31114968196

[1, 4, 4, 0, 12, 40, 0, 0, 84, 136, 440, 0, 0, 1864, 0, 0, 3948, 12776, 10336, 0, 54120, 0, 0, 0, 0, 900300, 971144, 0, 0, 4113832, 0, 0, 8713236, 0, 45623096, 0, 59721408, 193262536, 0, 0, 818673240, 1324641128, 0, 0, 0, 9079225360, 0, 0, 0, 31114968196]

cp's OEIS Frontend

A205507 a(n) = Fibonacci(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