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

Terms

a(0) =1a(1) =0a(2) =2a(3) =2a(4) =2a(5) =2a(6) =6a(7) =6a(8) =10a(9) =10a(10) =14a(11) =14a(12) =26a(13) =26a(14) =38a(15) =46a(16) =58a(17) =66a(18) =86a(19) =94a(20) =130a(21) =146a(22) =182a(23) =214a(24) =274a(25) =306a(26) =382a(27) =438a(28) =530a(29) =602