Average of terms of n-th row of A077321.

Terms

a(0) =2a(1) =4a(2) =13a(3) =31a(4) =55a(5) =77a(6) =215a(7) =227a(8) =271a(9) =308a(10) =661a(11) =438a(12) =825a(13) =806a(14) =1229a(15) =1271a(16) =1943a(17) =1388a(18) =2379a(19) =2106a(20) =2997a(21) =2393a(22) =3377a(23) =2856a(24) =4437a(25) =4051a(26) =6043a(27) =4299a(28) =7041a(29) =4157