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A370583 as a simple table

na(n)
00
11
22
34
410
520
644
788
8204
9440
10908
111816
123776
137552
1415364
1531240
1663744
17127488
18257592
19515184
201036336
212079312
224166408
238332816
2416709632
2533470464
2666978208
27134067488
28268236928
29536473856
301073233840
312146467680
324293851680
338588355424
3417177430640

[0,1,2,4,10,20,44,88,204,440,908,1816,3776,7552,
 15364,31240,63744,127488,257592,515184,1036336,
 2079312,4166408,8332816,16709632,33470464,
 66978208,134067488,268236928,536473856,1073233840,
 2146467680,4293851680,8588355424,17177430640]