A033140 - cp's OEIS frontend

A033140 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.

n	a(n)
1	1
2	4
3	16
4	65
5	260
6	1040
7	4161
8	16644
9	66576
10	266305
11	1065220
12	4260880
13	17043521
14	68174084
15	272696336
16	1090785345
17	4363141380
18	17452565520
19	69810262081
20	279241048324
21	1116964193296
22	4467856773185
23	17871427092740
24	71485708370960

[1, 4, 16, 65, 260, 1040, 4161, 16644, 66576, 266305, 1065220, 4260880, 17043521, 68174084, 272696336, 1090785345, 4363141380, 17452565520, 69810262081, 279241048324, 1116964193296, 4467856773185, 17871427092740, 71485708370960]

cp's OEIS Frontend

A033140 Base-4 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,0.

Table of values

List of values