login

A002870 as a simple table

na(n)
11
21
33
47
525
690
7350
81701
97770
1042525
11246730
121379400
139321312
1463436373
15420693273
163281882604
1725708104786
18197462483400
191709751003480
2015170932662679
21132511015347084
221241963303533920
2312320068811796900
24120622574326072500
251203163392175387500

[1,1,3,7,25,90,350,1701,7770,42525,246730,1379400,
 9321312,63436373,420693273,3281882604,25708104786,
 197462483400,1709751003480,15170932662679,
 132511015347084,1241963303533920,
 12320068811796900,120622574326072500,
 1203163392175387500]