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A316766 as a simple table

na(n)
11
21
32
43
56
613
730
872
9180
10458
111194
123160
138459
1422881
1562417
16171526
17474405
181319395
193687711
2010352696
2129178988

[1,1,2,3,6,13,30,72,180,458,1194,3160,8459,22881,
 62417,171526,474405,1319395,3687711,10352696,
 29178988]