p-INVERT of the odd positive integers, where p(S) = (1 - S)^3.

Terms

a(0) =3a(1) =15a(2) =61a(3) =240a(4) =912a(5) =3376a(6) =12240a(7) =43632a(8) =153360a(9) =532656a(10) =1831248a(11) =6240240a(12) =21100176a(13) =70858800a(14) =236510928a(15) =785115504a(16) =2593432080a(17) =8528565168a(18) =27932538960a(19) =91144257264a(20) =296391022992a(21) =960802812720