Number of distinct coefficients in expansion related to enumeration of permutations of length n by length of longest subsequence.

A068604

Number of distinct coefficients in expansion related to enumeration of permutations of length n by length of longest subsequence.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =16a(7) =29a(8) =51a(9) =84a(10) =138a(11) =227a(12) =370a(13) =603a(14) =980a(15) =1589a(16) =2576a(17) =4172a(18) =6756a(19) =10936a(20) =17700a(21) =28646a(22) =46357a(23) =75013a(24) =121381a(25) =196405

External references