First row of infinite array A(j,k): A(j,1) = j-1; A(1,k) = A(2,k-1); for j, k > 1, A(j,k) = A(j-1,k) - A(j+1,k-1) if that number is positive and not already in column k, A(j,k) = A(j-1,k) + A(j+1,k-1) otherwise.

A140985

First row of infinite array A(j,k): A(j,1) = j-1; A(1,k) = A(2,k-1); for j, k > 1, A(j,k) = A(j-1,k) - A(j+1,k-1) if that number is positive and not already in column k, A(j,k) = A(j-1,k) + A(j+1,k-1) otherwise.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =9a(4) =2a(5) =18a(6) =15a(7) =69a(8) =228a(9) =90a(10) =58a(11) =438a(12) =174a(13) =1540a(14) =579a(15) =4957a(16) =1860a(17) =6340a(18) =3572a(19) =20646a(20) =10276a(21) =72070a(22) =33978a(23) =21794a(24) =134644a(25) =66308a(26) =32884a(27) =284546a(28) =154006a(29) =12326

External references