A131951 - OEIS

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A131951 as a simple table

n	a(n)
0	1
1	6
2	14
3	26
4	44
5	72
6	118
7	198
8	344
9	620
10	1154
11	2202
12	4276
13	8400
14	16622
15	33038
16	65840
17	131412
18	262522
19	524706
20	1049036
21	2097656
22	4194854
23	8389206
24	16777864
25	33555132
26	67109618

[1,6,14,26,44,72,118,198,344,620,1154,2202,4276, 8400,16622,33038,65840,131412,262522,524706, 1049036,2097656,4194854,8389206,16777864,33555132, 67109618]