Triangle read by rows: T(n,k) is the number of nonisomorphic magmas with n elements whose center contains k elements.

A391155

Triangle read by rows: T(n,k) is the number of nonisomorphic magmas with n elements whose center contains k elements.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =6a(4) =0a(5) =4a(6) =2463a(7) =738a(8) =0a(9) =129a(10) =168710720a(11) =9440320a(12) =786944a(13) =0a(14) =43968a(17) =284835366875a(18) =10173301905a(19) =0a(20) =254429900a(26) =0

External references