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A141249
as a simple table
n
a(n)
1
1
2
21
3
33
4
45
5
73
6
81
7
193
8
201
9
241
10
273
11
313
12
381
13
421
14
445
15
453
16
661
17
693
18
861
19
885
20
913
[1,21,33,45,73,81,193,201,241,273,313,381,421,445, 453,661,693,861,885,913]