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A321813 as a simple table

na(n)
11
21
319684
41
51953126
619684
740353608
81
9387440173
101953126
112357947692
1219684
1310604499374
1440353608
1538445332184
161
17118587876498
18387440173
19322687697780
201953126
21794320419872
222357947692
231801152661464
2419684
253814699218751

[1,1,19684,1,1953126,19684,40353608,1,387440173,
 1953126,2357947692,19684,10604499374,40353608,
 38445332184,1,118587876498,387440173,322687697780,
 1953126,794320419872,2357947692,1801152661464,
 19684,3814699218751]