A383623 - cp's OEIS frontend

A383623 a(n) = 4^n - (n^2 + 3n + 4)2^(n-2).

n	a(n)
0	0
1	0
2	2
3	20
4	128
5	672
6	3168
7	14016
8	59648
9	247808
10	1014272
11	4113408
12	16588800
13	66674688
14	267444224
15	1071497216
16	4289921024
17	17168596992
18	68694441984
19	274822594560
20	1099389992960
21	4397780172800
22	17591605133312
23	70367481692160
24	281472242024448

[0, 0, 2, 20, 128, 672, 3168, 14016, 59648, 247808, 1014272, 4113408, 16588800, 66674688, 267444224, 1071497216, 4289921024, 17168596992, 68694441984, 274822594560, 1099389992960, 4397780172800, 17591605133312, 70367481692160, 281472242024448]

cp's OEIS Frontend

A383623 a(n) = 4^n - (n^2 + 3n + 4)2^(n-2).

Table of values

List of values

cp's OEIS Frontend

A383623 a(n) = 4^n - (n^2 + 3*n + 4)*2^(n-2).

Table of values

List of values

A383623 a(n) = 4^n - (n^2 + 3n + 4)2^(n-2).