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A331606 as a simple table

na(n)
11
21
34
44
512
618
744
872
9158
10288
11604
121146
132332
144528
159126
1617944
1735940
1871130
19142132
20282344
21563630
221121936
232239060
244462530
258906236
2617764160
2735458774
2870761520
29141272876
30282025466
31563159588
321124543256
332245918406
344485670168
358960061076

[1,1,4,4,12,18,44,72,158,288,604,1146,2332,4528,
 9126,17944,35940,71130,142132,282344,563630,
 1121936,2239060,4462530,8906236,17764160,35458774,
 70761520,141272876,282025466,563159588,1124543256,
 2245918406,4485670168,8960061076]