Number of integer compositions of n whose 0-prepended first differences are not all distinct.

A389744

Number of integer compositions of n whose 0-prepended first differences are not all distinct.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =6a(6) =18a(7) =36a(8) =88a(9) =189a(10) =406a(11) =840a(12) =1755a(13) =3615a(14) =7459a(15) =15186a(16) =30957a(17) =62719a(18) =126706a(19) =255377a(20) =513886a(21) =1032620a(22) =2072774a(23) =4157680a(24) =8333096a(25) =16694856

External references