A378499 - cp's OEIS frontend

A378499 a(n) is the number whose base-4 digits are 1 followed by the first n-1 terms of the periodic sequence with initial period 0,3,2.

n	a(n)
1	1
2	4
3	19
4	78
5	312
6	1251
7	5006
8	20024
9	80099
10	320398
11	1281592
12	5126371
13	20505486
14	82021944
15	328087779
16	1312351118
17	5249404472
18	20997617891
19	83990471566
20	335961886264
21	1343847545059
22	5375390180238
23	21501560720952
24	86006242883811
25	344024971535246

[1, 4, 19, 78, 312, 1251, 5006, 20024, 80099, 320398, 1281592, 5126371, 20505486, 82021944, 328087779, 1312351118, 5249404472, 20997617891, 83990471566, 335961886264, 1343847545059, 5375390180238, 21501560720952, 86006242883811, 344024971535246]

cp's OEIS Frontend

A378499 a(n) is the number whose base-4 digits are 1 followed by the first n-1 terms of the periodic sequence with initial period 0,3,2.

Table of values

List of values