Alkane (or paraffin) numbers l(13,n).

Terms

a(0) =1a(1) =6a(2) =36a(3) =146a(4) =511a(5) =1512a(6) =4032a(7) =9752a(8) =21942a(9) =46252a(10) =92504a(11) =176484a(12) =323554a(13) =572264a(14) =981024a(15) =1634776a(16) =2656511a(17) =4218786a(18) =6562556a(19) =10016006a(20) =15024009a(21) =22177584a(22) =32258304a(23) =46282704a(24) =65567164a(25) =91792792a(26) =127097712a(27) =174169352