Number of permutations of n distinct letters (ABCD...) each of which appears 5 times and having n-2 fixed points.

A123296

Number of permutations of n distinct letters (ABCD...) each of which appears 5 times and having n-2 fixed points.

Terms

    a(0) =0a(1) =25a(2) =75a(3) =150a(4) =250a(5) =375a(6) =525a(7) =700a(8) =900a(9) =1125a(10) =1375a(11) =1650a(12) =1950a(13) =2275a(14) =2625a(15) =3000a(16) =3400a(17) =3825a(18) =4275a(19) =4750a(20) =5250a(21) =5775a(22) =6325a(23) =6900a(24) =7500a(25) =8125a(26) =8775a(27) =9450a(28) =10150a(29) =10875

External references