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A261057 as a simple table

na(n)
10
20
31
41
55
613
740
8123
9388
101284
114332
1214868
1351094
14178361
15634422
162260717
178066841
1829030051
19105247340
20383574146
211404657053
225171018981
2319140750300
2471124341227
25263546155710
26983417309702
273684399940711
2813818092760075
2951937827473594
30195956606402526

[0,0,1,1,5,13,40,123,388,1284,4332,14868,51094,
 178361,634422,2260717,8066841,29030051,105247340,
 383574146,1404657053,5171018981,19140750300,
 71124341227,263546155710,983417309702,
 3684399940711,13818092760075,51937827473594,
 195956606402526]