Duplicate of A089117.

Terms

a(0) =0a(1) =1a(2) =3a(3) =10a(4) =25a(5) =64a(6) =146a(7) =331a(8) =710a(9) =1505a(10) =3091a(11) =6272a(12) =12473a(13) =24540a(14) =47610a(15) =91527