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A017738 as a simple table

na(n)
741
7575
762850
7773150
781426425
7922537515
80300500200
813477216600
8235641470150
83328693558050
842761025887620
8521335200040700
86152902266958350
871023269017336650
886431976680401800
8938163061637050680

[1,75,2850,73150,1426425,22537515,300500200,
 3477216600,35641470150,328693558050,2761025887620,
 21335200040700,152902266958350,1023269017336650,
 6431976680401800,38163061637050680]