Number of permutations of n letters where exactly 5 change position.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =44a(5) =264a(6) =924a(7) =2464a(8) =5544a(9) =11088a(10) =20328a(11) =34848a(12) =56628a(13) =88088a(14) =132132a(15) =192192a(16) =272272a(17) =376992a(18) =511632a(19) =682176a(20) =895356a(21) =1158696a(22) =1480556a(23) =1870176a(24) =2337720a(25) =2894320a(26) =3552120a(27) =4324320a(28) =5225220a(29) =6270264