Number of connected numbers (A029827) with binary order (A029837) <= n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =6a(6) =14a(7) =35a(8) =77a(9) =166a(10) =346a(11) =707a(12) =1427a(13) =2865a(14) =5732a(15) =11428a(16) =22710a(17) =45102a(18) =89442a(19) =177329a(20) =351374a(21) =696093a(22) =1378860a(23) =2731235a(24) =5409540a(25) =10715171a(26) =21226041a(27) =42050951a(28) =83315605a(29) =165092603