A263402 - cp's OEIS frontend

A263402 Define Z(1) = {1}, and Z(n+1) = Z(n) (+) { x+y, with x and y in Z(n) } for any n>0 (where (+) stands for the symmetric difference of two sets). Then a(n) gives the number of elements in Z(n).

n	a(n)
1	1
2	2
3	3
4	7
5	10
6	22
7	42
8	87
9	170
10	342
11	686
12	1365
13	2727
14	5468
15	10919
16	21857
17	43680
18	87389
19	174756
20	349539
21	699039
22	1398115
23	2796191
24	5592422
25	11184795
26	22369639
27	44739229
28	89478503
29	178956950
30	357913967
31	715827858
32	1431655793
33	2863311503
34	5726623097
35	11453246088

[1, 2, 3, 7, 10, 22, 42, 87, 170, 342, 686, 1365, 2727, 5468, 10919, 21857, 43680, 87389, 174756, 349539, 699039, 1398115, 2796191, 5592422, 11184795, 22369639, 44739229, 89478503, 178956950, 357913967, 715827858, 1431655793, 2863311503, 5726623097, 11453246088]

cp's OEIS Frontend

A263402 Define Z(1) = {1}, and Z(n+1) = Z(n) (+) { x+y, with x and y in Z(n) } for any n>0 (where (+) stands for the symmetric difference of two sets). Then a(n) gives the number of elements in Z(n).

Table of values

List of values