Duplicate of A061256.

Terms

a(0) =1a(1) =1a(2) =4a(3) =8a(4) =21a(5) =39a(6) =92a(7) =170a(8) =360a(9) =667a(10) =1316a(11) =2393a(12) =4541a(13) =8100a(14) =14824a(15) =26071