A193519 - cp's OEIS frontend

A193519 a(n) = (2/3)Sum_{i=1..n-1} A000129(i)3^(n-i).

n	a(n)
0	0
1	0
2	2
3	10
4	40
5	144
6	490
7	1610
8	5168
9	16320
10	50930
11	157546
12	484120
13	1480080
14	4507162
15	13683050
16	41439200
17	125259264
18	378051170
19	1139641930
20	3432176008
21	10328516880
22	31062778570
23	93374780426
24	280574458640
25	842810055360
26	2531053642322
27	7599494558890
28	22813774416760
29	68478238362384

[0, 0, 2, 10, 40, 144, 490, 1610, 5168, 16320, 50930, 157546, 484120, 1480080, 4507162, 13683050, 41439200, 125259264, 378051170, 1139641930, 3432176008, 10328516880, 31062778570, 93374780426, 280574458640, 842810055360, 2531053642322, 7599494558890, 22813774416760, 68478238362384]

cp's OEIS Frontend

A193519 a(n) = (2/3)Sum_{i=1..n-1} A000129(i)3^(n-i).

Table of values

List of values

cp's OEIS Frontend

A193519 a(n) = (2/3)*Sum_{i=1..n-1} A000129(i)*3^(n-i).

Table of values

List of values

A193519 a(n) = (2/3)Sum_{i=1..n-1} A000129(i)3^(n-i).