A216980 - OEIS

A216980 as a simple table

n	a(n)
1	0
2	1
3	9
4	21
5	53
6	63
7	99
8	123
9	141
10	155
11	185
12	213
13	315
14	363
15	375
16	449
17	513
18	521
19	543
20	555
21	653
22	669
23	699
24	731
25	735
26	759
27	801
28	843
29	881
30	975
31	983
32	995
33	1031
34	1095
35	1115
36	1131
37	1149
38	1161
39	1221
40	1253
41	1395
42	1413
43	1451
44	1473
45	1491
46	1571
47	1599
48	1625
49	1659
50	1733

[0,1,9,21,53,63,99,123,141,155,185,213,315,363, 375,449,513,521,543,555,653,669,699,731,735,759, 801,843,881,975,983,995,1031,1095,1115,1131,1149, 1161,1221,1253,1395,1413,1451,1473,1491,1571,1599, 1625,1659,1733]