a(n) = determinant([a(n-1), a(n-2); a(n-4), a(n-3)]) for n >= 5, a(n) = n otherwise.

A337188

a(n) = determinant([a(n-1), a(n-2); a(n-4), a(n-3)]) for n >= 5, a(n) = n otherwise.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =13a(7) =37a(8) =194a(9) =2263a(10) =81209a(11) =15670815a(12) =35447299799

External references