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A013887 as a simple table

na(n)
0324
1612220032
21156831381426176
32185911559738696531968
44130428534112329328517709824
57804725584345565904628551916716032
614747559712960682275277163588165279154176
727866516911699690485530919446962290200798035968

[324,612220032,1156831381426176,
 2185911559738696531968,
 4130428534112329328517709824,
 7804725584345565904628551916716032,
 14747559712960682275277163588165279154176,
 27866516911699690485530919446962290200798035968]