Arithmetic derivative of the double factorial of n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =12a(5) =8a(6) =112a(7) =71a(8) =1472a(9) =1269a(10) =17408a(11) =14904a(12) =270336a(13) =204147a(14) =4199424a(15) =4143285a(16) =87834624a(17) =72462870a(18) =1797783552a(19) =1411253955a(20) =40414740480a(21) =36183623805a(22) =937430876160a(23) =845972658090