Ninth convolution of Schroeder's (second problem) numbers A001003(n), n>=0.
A111997
Ninth convolution of Schroeder's (second problem) numbers A001003(n), n>=0.
Terms
- a(0) =1a(1) =9a(2) =63a(3) =399a(4) =2403a(5) =14067a(6) =80949a(7) =460845a(8) =2605590a(9) =14666470a(10) =82320714a(11) =461238282a(12) =2581644378a(13) =14442658074a(14) =80785970838a(15) =451934259654
External references
- oeis: A111997