The convolution matrix of the double factorial of odd numbers (A001147).

Terms

a(0) =1a(1) =3a(2) =1a(3) =15a(4) =9a(5) =1a(6) =105a(7) =87a(8) =18a(9) =1a(10) =945a(11) =975a(12) =285a(13) =30a(14) =1a(15) =10395a(16) =12645a(17) =4680a(18) =705a(19) =45a(20) =1a(21) =135135a(22) =187425a(23) =82845a(24) =15960a(25) =1470a(26) =63a(27) =1a(28) =2027025a(29) =3133935