Logarithmic derivative of A001002.

Terms

a(0) =1a(1) =5a(2) =22a(3) =105a(4) =511a(5) =2534a(6) =12720a(7) =64449a(8) =328900a(9) =1688115a(10) =8705060a(11) =45064110a(12) =234054198a(13) =1219053680a(14) =6364813192a(15) =33302104593a(16) =174570695175a(17) =916628799380