Irregular triangle T(n,k) (n >= 1, k >= 1) read by rows: T(n,1) = 2^n - 1; for k>1, T(n,k) = 0 for n <= 2*(k-1); otherwise T(n+1,k) = T(n,k-1) + T(n,k).

A201385

Irregular triangle T(n,k) (n >= 1, k >= 1) read by rows: T(n,1) = 2^n - 1; for k>1, T(n,k) = 0 for n <= 2*(k-1); otherwise T(n+1,k) = T(n,k-1) + T(n,k).

Terms

    a(0) =1a(1) =3a(2) =7a(3) =3a(4) =15a(5) =10a(6) =31a(7) =25a(8) =10a(9) =63a(10) =56a(11) =35a(12) =127a(13) =119a(14) =91a(15) =35a(16) =255a(17) =246a(18) =210a(19) =126a(20) =511a(21) =501a(22) =456a(23) =336a(24) =126a(25) =1023a(26) =1012a(27) =957a(28) =792a(29) =462

External references