Row sums up to the main diagonal of the "postage stamp" array (n,m >= 0) defined in A007059.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =21a(5) =53a(6) =130a(7) =310a(8) =724a(9) =1661a(10) =3757a(11) =8398a(12) =18588a(13) =40800a(14) =88918a(15) =192592a(16) =414907a(17) =889631a(18) =1899554a(19) =4040864a(20) =8567342a(21) =18109698a(22) =38176280a(23) =80278798a(24) =168432854a(25) =352658013a(26) =736977583a(27) =1537420460a(28) =3202035086a(29) =6658948608