A231919 - cp's OEIS frontend

A231919 a(n) = 3^n + (4^n - 3^n) * (d(n) - 3), where d(n) = A000005(n).

n	a(n)
1	1
2	2
3	-10
4	81
5	-538
6	4096
7	-12010
8	65536
9	19683
10	1048576
11	-3840010
12	49268766
13	-63920218
14	268435456
15	1073741824
16	8546887871
17	-16921588858
18	205383589230
19	-272553384010
20	3291561314526
21	4398046511104
22	17592186044416
23	-70180457820010
24	1406245165407356
25	847288609443

[1, 2, -10, 81, -538, 4096, -12010, 65536, 19683, 1048576, -3840010, 49268766, -63920218, 268435456, 1073741824, 8546887871, -16921588858, 205383589230, -272553384010, 3291561314526, 4398046511104, 17592186044416, -70180457820010, 1406245165407356, 847288609443]

cp's OEIS Frontend

A231919 a(n) = 3^n + (4^n - 3^n) * (d(n) - 3), where d(n) = A000005(n).

Table of values

List of values