Sums of rows of Zorach additive triangle (cf. A035312).

Terms

a(0) =1a(1) =5a(2) =19a(3) =61a(4) =146a(5) =336a(6) =757a(7) =1711a(8) =3868a(9) =8752a(10) =19680a(11) =43869a(12) =96695a(13) =210638a(14) =453863a(15) =968875a(16) =2053227a(17) =4328457a(18) =9093933a(19) =19068574a(20) =39943650a(21) =83628355a(22) =175018478a(23) =366081158a(24) =765102861a(25) =1597315609a(26) =3330380539a(27) =6933810090a(28) =14414812994a(29) =29924339675