login

A290909 as a simple table

na(n)
00
15
220
375
4300
51200
64780
719045
875900
9302475
101205400
114803680
1219143320
1376288725
14304020900
151211564475
164828248580
1719241224720
1876678887300
19305575754325
201217760780300
214852941691355
2219339630115120
2377071046136000
24307138560414000

[0,5,20,75,300,1200,4780,19045,75900,302475,
 1205400,4803680,19143320,76288725,304020900,
 1211564475,4828248580,19241224720,76678887300,
 305575754325,1217760780300,4852941691355,
 19339630115120,77071046136000,307138560414000]