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A138870 as a simple table

na(n)
12
24
316
464
5409
6655
7262
8107
9115
10309
11811
12850
13343
14265
15520
16737
17223
18129
19953
20142
21239
22173
23140
24215
25224
26201
27427
28268
29260
30256
31373
32870
33647
34206
35407
36311
37637
38218
39462
40629
41149
42610
43157
44622
45101
46849
47158

[2,4,16,64,409,655,262,107,115,309,811,850,343,
 265,520,737,223,129,953,142,239,173,140,215,224,
 201,427,268,260,256,373,870,647,206,407,311,637,
 218,462,629,149,610,157,622,101,849,158]