G.f.: Sum_{k>=0} 2^k * x^(k^2) / Product_{j=1..k} (1 - x^j).

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =6a(5) =6a(6) =10a(7) =10a(8) =14a(9) =22a(10) =26a(11) =34a(12) =46a(13) =54a(14) =66a(15) =82a(16) =110a(17) =126a(18) =162a(19) =194a(20) =246a(21) =286a(22) =354a(23) =410a(24) =502a(25) =606a(26) =714a(27) =842a(28) =1014a(29) =1190