Convolution of odd numbers and A023533.

Terms

a(0) =1a(1) =3a(2) =5a(3) =8a(4) =12a(5) =16a(6) =20a(7) =24a(8) =28a(9) =33a(10) =39a(11) =45a(12) =51a(13) =57a(14) =63a(15) =69a(16) =75a(17) =81a(18) =87a(19) =94a(20) =102a(21) =110a(22) =118a(23) =126a(24) =134a(25) =142a(26) =150a(27) =158a(28) =166a(29) =174