A269255 - cp's OEIS frontend

A269255 a(n) = (2^(2n+1) - 1)(3^(n+1) - 1)/2.

n	a(n)
0	1
1	28
2	403
3	5080
4	61831
5	745108
6	8952763
7	107475760
8	1289869711
9	15479049388
10	185750955523
11	2229020652040
12	26748283770391
13	320979546636868
14	3851755118036683
15	46221063628493920
16	554652772325571871
17	6655833302847731548
18	79869999773355124243
19	958439997835247481400
20	11501279976237683562151

[1, 28, 403, 5080, 61831, 745108, 8952763, 107475760, 1289869711, 15479049388, 185750955523, 2229020652040, 26748283770391, 320979546636868, 3851755118036683, 46221063628493920, 554652772325571871, 6655833302847731548, 79869999773355124243, 958439997835247481400, 11501279976237683562151]

cp's OEIS Frontend

A269255 a(n) = (2^(2n+1) - 1)(3^(n+1) - 1)/2.

Table of values

List of values

cp's OEIS Frontend

A269255 a(n) = (2^(2*n+1) - 1)*(3^(n+1) - 1)/2.

Table of values

List of values

A269255 a(n) = (2^(2n+1) - 1)(3^(n+1) - 1)/2.