A122554 - cp's OEIS frontend

A122554 Let S(1) = {1} and, for n>1 let S(n) be the smallest set containing x, 2x and x+2 for each element x in S(n-1). a(n) is the number of elements in S(n).

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	23
7	35
8	54
9	84
10	132
11	209
12	333
13	533
14	856
15	1378
16	2222
17	3587
18	5795
19	9367
20	15146
21	24496
22	39624
23	64101
24	103705
25	167785
26	271468
27	439230
28	710674
29	1149879
30	1860527
31	3010379
32	4870878
33	7881228
34	12752076
35	20633273
36	33385317
37	54018557
38	87403840
39	141422362

[1, 3, 6, 10, 15, 23, 35, 54, 84, 132, 209, 333, 533, 856, 1378, 2222, 3587, 5795, 9367, 15146, 24496, 39624, 64101, 103705, 167785, 271468, 439230, 710674, 1149879, 1860527, 3010379, 4870878, 7881228, 12752076, 20633273, 33385317, 54018557, 87403840, 141422362]

cp's OEIS Frontend

A122554 Let S(1) = {1} and, for n>1 let S(n) be the smallest set containing x, 2x and x+2 for each element x in S(n-1). a(n) is the number of elements in S(n).

Table of values

List of values