a(n) = sum along n-th diagonal of A094102 (sloping downward to left).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =8a(7) =9a(8) =13a(9) =16a(10) =22a(11) =26a(12) =37a(13) =43a(14) =60a(15) =71a(16) =98a(17) =115a(18) =160a(19) =187a(20) =259a(21) =304a(22) =420a(23) =492a(24) =681a(25) =797a(26) =1102a(27) =1291a(28) =1784a(29) =2089