Convolution of odd numbers and A001950.

Terms

a(0) =2a(1) =11a(2) =32a(3) =70a(4) =131a(5) =220a(6) =342a(7) =502a(8) =705a(9) =957a(10) =1263a(11) =1628a(12) =2058a(13) =2558a(14) =3133a(15) =3788a(16) =4528a(17) =5359a(18) =6286a(19) =7314a(20) =8448a(21) =9693a(22) =11055a(23) =12539a(24) =14150a(25) =15894a(26) =17776a(27) =19801a(28) =21974a(29) =24300