Nearest integer to Sum_{k=0..n} binomial(n,k)/2^(k*(k-1)/2).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =12a(6) =17a(7) =23a(8) =31a(9) =41a(10) =52a(11) =66a(12) =82a(13) =101a(14) =124a(15) =150a(16) =180a(17) =215a(18) =254a(19) =299a(20) =351a(21) =408a(22) =473a(23) =546a(24) =628a(25) =719a(26) =820a(27) =932a(28) =1055a(29) =1192