Numerator of 24*Stirling_2(n,4)/n!.

Terms

a(0) =1a(1) =2a(2) =13a(3) =5a(4) =81a(5) =37a(6) =6821a(7) =265a(8) =55591a(9) =253a(10) =7613a(11) =3103a(12) =171798901a(13) =4084337a(14) =2532857a(15) =99599a(16) =113363699a(17) =91901a(18) =2646467723a(19) =4191653a(20) =507872027587a(21) =2234653117a(22) =45720722087a(23) =54895900259