A007040 - OEIS

A007040 as a simple table

n	a(n)
1	2
2	2
3	6
4	6
5	10
6	20
7	28
8	46
9	78
10	122
11	198
12	324
13	520
14	842
15	1366
16	2206
17	3570
18	5780
19	9348
20	15126
21	24478
22	39602
23	64078
24	103684
25	167760
26	271442
27	439206
28	710646
29	1149850
30	1860500
31	3010348
32	4870846
33	7881198
34	12752042
35	20633238
36	33385284
37	54018520

[2,2,6,6,10,20,28,46,78,122,198,324,520,842,1366, 2206,3570,5780,9348,15126,24478,39602,64078, 103684,167760,271442,439206,710646,1149850, 1860500,3010348,4870846,7881198,12752042,20633238, 33385284,54018520]