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A056385 as a simple table

na(n)
16
230
3120
4720
52010
623820
746950
8434700
91683450
1015126810
1136284466
12547180200
131088416050
1413060942950
1558782162480
16352913410080
171057916846190
1816926687985950
1933853322280030

[6,30,120,720,2010,23820,46950,434700,1683450,
 15126810,36284466,547180200,1088416050,
 13060942950,58782162480,352913410080,
 1057916846190,16926687985950,33853322280030]