Jordan function J_n(6) (see A059379).

Terms

a(0) =0a(1) =2a(2) =24a(3) =182a(4) =1200a(5) =7502a(6) =45864a(7) =277622a(8) =1672800a(9) =10057502a(10) =60406104a(11) =362617862a(12) =2176246800a(13) =13059091502a(14) =78359364744a(15) =470170602902