A227978 - cp's OEIS frontend

A227978 a(0)=1, a(1)=2; for n>1, a(n) = n*(2^n+4)/4.

n	a(n)
0	1
1	2
2	4
3	9
4	20
5	45
6	102
7	231
8	520
9	1161
10	2570
11	5643
12	12300
13	26637
14	57358
15	122895
16	262160
17	557073
18	1179666
19	2490387
20	5242900
21	11010069
22	23068694
23	48234519
24	100663320
25	209715225
26	436207642
27	905969691
28	1879048220
29	3892314141
30	8053063710
31	16642998303

[1, 2, 4, 9, 20, 45, 102, 231, 520, 1161, 2570, 5643, 12300, 26637, 57358, 122895, 262160, 557073, 1179666, 2490387, 5242900, 11010069, 23068694, 48234519, 100663320, 209715225, 436207642, 905969691, 1879048220, 3892314141, 8053063710, 16642998303]

cp's OEIS Frontend

A227978 a(0)=1, a(1)=2; for n>1, a(n) = n*(2^n+4)/4.

Table of values

List of values