A020331 - OEIS

A020331 as a simple table

n	a(n)
1	4
2	8
3	30
4	40
5	50
6	60
7	70
8	80
9	252
10	280
11	308
12	336
13	364
14	392
15	420
16	448
17	476
18	504
19	532
20	560
21	588
22	616
23	644
24	672
25	700
26	728
27	2214
28	2296
29	2378
30	2460
31	2542
32	2624
33	2706
34	2788
35	2870
36	2952
37	3034
38	3116
39	3198
40	3280
41	3362
42	3444
43	3526
44	3608
45	3690
46	3772
47	3854
48	3936
49	4018

[4,8,30,40,50,60,70,80,252,280,308,336,364,392, 420,448,476,504,532,560,588,616,644,672,700,728, 2214,2296,2378,2460,2542,2624,2706,2788,2870,2952, 3034,3116,3198,3280,3362,3444,3526,3608,3690,3772, 3854,3936,4018]