a(n) = T(2n,n), where T is the array defined in A026105.

A026112

a(n) = T(2n,n), where T is the array defined in A026105.

Terms

    a(0) =1a(1) =1a(2) =6a(3) =30a(4) =160a(5) =873a(6) =4851a(7) =27300a(8) =155115a(9) =887910a(10) =5112767a(11) =29582886a(12) =171857127a(13) =1001762125a(14) =5856231825a(15) =34320863160a(16) =201579530004

External references