A215815 - OEIS

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A215815 as a simple table

n	a(n)
1	2
2	4
3	20
4	22
5	26
6	28
7	46
8	52
9	68
10	76
11	116
12	118
13	140
14	164
15	172
16	194
17	242
18	244
19	284
20	314
21	316
22	356
23	358
24	362
25	382
26	404
27	428
28	458
29	478
30	598
31	698
32	746
33	772
34	794
35	812
36	914
37	988
38	1004
39	1082

[2,4,20,22,26,28,46,52,68,76,116,118,140,164,172, 194,242,244,284,314,316,356,358,362,382,404,428, 458,478,598,698,746,772,794,812,914,988,1004,1082]