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A316694 as a simple table

na(n)
11
21
32
43
56
613
728
862
9143
10338
11804
121948
134789
1411886
1529796
1675316
17191702
18491040
191264926
203274594
218514784
2222229481
2358243870

[1,1,2,3,6,13,28,62,143,338,804,1948,4789,11886,
 29796,75316,191702,491040,1264926,3274594,8514784,
 22229481,58243870]