a(n) = T(5,n), array T given by A048505.

Terms

a(0) =1a(1) =37a(2) =122a(3) =320a(4) =776a(5) =1816a(6) =4168a(7) =9448a(8) =21224a(9) =47336a(10) =104936a(11) =231400a(12) =507880a(13) =1109992a(14) =2416616a(15) =5242856a(16) =11337704a(17) =24444904a(18) =52559848a(19) =112721896a(20) =241172456a(21) =514850792a(22) =1096810472a(23) =2332033000a(24) =4949278696a(25) =10485759976a(26) =22179479528a(27) =46841987048a(28) =98784247784