a(0)=0, a(1)=1, for n>1, a(n) = floor(a(n-1)/n) + a(n-2)*2.

Terms

a(0) =0a(1) =1a(2) =0a(3) =2a(4) =0a(5) =4a(6) =0a(7) =8a(8) =1a(9) =16a(10) =3a(11) =32a(12) =8a(13) =64a(14) =20a(15) =129a(16) =48a(17) =260a(18) =110a(19) =525a(20) =246a(21) =1061a(22) =540a(23) =2145a(24) =1169a(25) =4336a(26) =2504a(27) =8764a(28) =5321a(29) =17711