Doubles (index 2+) under "DGJ" (bracelet, element, labeled) transform.

A032227

Doubles (index 2+) under "DGJ" (bracelet, element, labeled) transform.

Terms

    a(0) =2a(1) =2a(2) =12a(3) =126a(4) =1800a(5) =33900a(6) =782880a(7) =21244650a(8) =666080520a(9) =23658839400a(10) =939138631200

External references