Partial sums of A005470.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =19a(5) =52a(6) =194a(7) =1016a(8) =7982a(9) =87835a(10) =1228751a(11) =19909759a(12) =353222210