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A045635 as a simple table

na(n)
10
20
31
49
557
6315
71629
88127
939718
10191754
11919035
124385799
1320879100
1499276840
15471848195
162242864575
1710665998760
1850757180840
19241743946635
201152434818755
215499250360025
2226268118117731
23125602004765391

[0,0,1,9,57,315,1629,8127,39718,191754,919035,
 4385799,20879100,99276840,471848195,2242864575,
 10665998760,50757180840,241743946635,
 1152434818755,5499250360025,26268118117731,
 125602004765391]