A228920 - cp's OEIS frontend

A228920 Number of solutions to Sum_{i=1..n} x_i^2 == 0 (mod 4) with x_i in 0..3.

n	a(n)
1	2
2	4
3	8
4	32
5	192
6	1024
7	4608
8	18432
9	69632
10	262144
11	1015808
12	4063232
13	16515072
14	67108864
15	270532608
16	1082130432
17	4311744512
18	17179869184
19	68585259008
20	274341036032
21	1098437885952
22	4398046511104
23	17600775979008
24	70403103916032
25	281543696187392

[2, 4, 8, 32, 192, 1024, 4608, 18432, 69632, 262144, 1015808, 4063232, 16515072, 67108864, 270532608, 1082130432, 4311744512, 17179869184, 68585259008, 274341036032, 1098437885952, 4398046511104, 17600775979008, 70403103916032, 281543696187392]

cp's OEIS Frontend

A228920 Number of solutions to Sum_{i=1..n} x_i^2 == 0 (mod 4) with x_i in 0..3.

Table of values

List of values