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A154656 as a simple table

na(n)
01
11
22
36
424
5120
6720
75040
840320
9287280
101865520
1111345160
1266349464
13381523758
142193664790
1512764590275
1675796724309
17455383613924
182750869551868
1916635586999056
20100439873614656
21604666567043712
223629299734118656
2321736009354060800
24130082373922081536

[1,1,2,6,24,120,720,5040,40320,287280,1865520,
 11345160,66349464,381523758,2193664790,
 12764590275,75796724309,455383613924,
 2750869551868,16635586999056,100439873614656,
 604666567043712,3629299734118656,
 21736009354060800,130082373922081536]