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A259088 as a simple table

na(n)
11
20
31
41
56
67
725
880
9255
10795
112919
1210378
1336590
14130716
15480773
161774714
176543633
1824208803
1990331307
20339178346
211277308160
224819109576

[1,0,1,1,6,7,25,80,255,795,2919,10378,36590,
 130716,480773,1774714,6543633,24208803,90331307,
 339178346,1277308160,4819109576]