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A331538 as a simple table

na(n)
00
11
23
316
4147
51756
625910
7453594
89184091
9211075288
105427652794
11154380255250
124812088559014
13163110595450466
145973198636395003
15235010723141883563
169886231689434154971
17442799642855527526848
1821038043034795035118742
191056802542597653892224802
2055962024535834950971809754

[0,1,3,16,147,1756,25910,453594,9184091,211075288,
 5427652794,154380255250,4812088559014,
 163110595450466,5973198636395003,
 235010723141883563,9886231689434154971,
 442799642855527526848,21038043034795035118742,
 1056802542597653892224802,
 55962024535834950971809754]