A257548 - cp's OEIS frontend

A257548 a(1) = 1, a(2) = 2, a(3) = 5, a(4) = 8 and a(5) = 15, a(n) = Sum_{j=1..n-1} a(j).

n	a(n)
1	1
2	2
3	5
4	8
5	15
6	31
7	62
8	124
9	248
10	496
11	992
12	1984
13	3968
14	7936
15	15872
16	31744
17	63488
18	126976
19	253952
20	507904
21	1015808
22	2031616
23	4063232
24	8126464
25	16252928
26	32505856
27	65011712
28	130023424
29	260046848
30	520093696
31	1040187392
32	2080374784
33	4160749568
34	8321499136

[1, 2, 5, 8, 15, 31, 62, 124, 248, 496, 992, 1984, 3968, 7936, 15872, 31744, 63488, 126976, 253952, 507904, 1015808, 2031616, 4063232, 8126464, 16252928, 32505856, 65011712, 130023424, 260046848, 520093696, 1040187392, 2080374784, 4160749568, 8321499136]

cp's OEIS Frontend

A257548 a(1) = 1, a(2) = 2, a(3) = 5, a(4) = 8 and a(5) = 15, a(n) = Sum_{j=1..n-1} a(j).

Table of values

List of values