Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A089851/A089853.

A089848

Number of fixed points in range [A014137(n-1)..A014138(n-1)] of permutation A089851/A089853.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =2a(4) =5a(5) =15a(6) =42a(7) =132a(8) =431a(9) =1430a(10) =4862a(11) =16801a(12) =58786a(13) =208012a(14) =742914a(15) =2674440a(16) =9694845a(17) =35357712a(18) =129644790a(19) =477638700a(20) =1767263322a(21) =6564120420a(22) =24466267020a(23) =91482564069a(24) =343059613650

External references