Sum of terms of n-th group in A075383.

Terms

a(0) =1a(1) =6a(2) =18a(3) =56a(4) =85a(5) =222a(6) =210a(7) =576a(8) =756a(9) =1090a(10) =858a(11) =2328a(12) =1573a(13) =3598a(14) =3930a(15) =5488a(16) =3111a(17) =8154a(18) =4427a(19) =11060a(20) =11676a(21) =15004a(22) =8073a(23) =21336a(24) =18125a(25) =24726a(26) =24516a(27) =32060a(28) =16530a(29) =43410