Sum of terms in n-th row of A081491.

Terms

a(0) =1a(1) =5a(2) =18a(3) =54a(4) =135a(5) =291a(6) =560a(7) =988a(8) =1629a(9) =2545a(10) =3806a(11) =5490a(12) =7683a(13) =10479a(14) =13980a(15) =18296a(16) =23545a(17) =29853a(18) =37354a(19) =46190a(20) =56511a(21) =68475a(22) =82248a(23) =98004a(24) =115925a(25) =136201a(26) =159030a(27) =184618a(28) =213179a(29) =244935