Unsigned third column (k=2) of triangle A136656 divided by 4.

A136659

Unsigned third column (k=2) of triangle A136656 divided by 4.

Terms

    a(0) =1a(1) =9a(2) =75a(3) =660a(4) =6300a(5) =65520a(6) =740880a(7) =9072000a(8) =119750400a(9) =1696464000a(10) =25686460800a(11) =414096883200

External references