a(n)=T(n,1)+T(n,n), array T given by A048212.

Terms

a(0) =4a(1) =4a(2) =11a(3) =19a(4) =29a(5) =39a(6) =54a(7) =72a(8) =89a(9) =113a(10) =137a(11) =163a(12) =189a(13) =216a(14) =254a(15) =288a(16) =323a(17) =363a(18) =402a(19) =446a(20) =495a(21) =544a(22) =593a(23) =651a(24) =710a(25) =772a(26) =835a(27) =898a(28) =964a(29) =1036