Product of the arithmetic derivatives from 2 to n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =4a(4) =20a(5) =20a(6) =240a(7) =1440a(8) =10080a(9) =10080a(10) =161280a(11) =161280a(12) =1451520a(13) =11612160a(14) =371589120a(15) =371589120a(16) =7803371520a(17) =7803371520a(18) =187280916480