A209398 - cp's OEIS frontend

A209398 Number of subsets of {1,...,n} containing two elements whose difference is 2.

n	a(n)
0	0
1	0
2	0
3	2
4	7
5	17
6	39
7	88
8	192
9	408
10	855
11	1775
12	3655
13	7478
14	15228
15	30898
16	62511
17	126177
18	254223
19	511472
20	1027840
21	2063600
22	4140015
23	8300767
24	16635087
25	33324462
26	66736764
27	133615658
28	267461287
29	535294673
30	1071191415
31	2143357000
32	4288290240
33	8579130888

[0, 0, 0, 2, 7, 17, 39, 88, 192, 408, 855, 1775, 3655, 7478, 15228, 30898, 62511, 126177, 254223, 511472, 1027840, 2063600, 4140015, 8300767, 16635087, 33324462, 66736764, 133615658, 267461287, 535294673, 1071191415, 2143357000, 4288290240, 8579130888]

cp's OEIS Frontend

A209398 Number of subsets of {1,...,n} containing two elements whose difference is 2.

Table of values

List of values