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A138408 as a simple table

na(n)
162
2726
315620
4117642
51771550
64826796
724137552
847045862
9148035866
10594823292
11887503650
122565726372
134750104200
146321363006
1510779215282
1622164361076
1742180533582
1851520374300
1990458382102
20128100283850

[62,726,15620,117642,1771550,4826796,24137552,
 47045862,148035866,594823292,887503650,2565726372,
 4750104200,6321363006,10779215282,22164361076,
 42180533582,51520374300,90458382102,128100283850]