Triangle read by rows: T(n,k) is the number of nonisomorphic magmas with n elements and a closed center of size k.
A391161
Triangle read by rows: T(n,k) is the number of nonisomorphic magmas with n elements and a closed center of size k.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =6a(4) =0a(5) =4a(6) =2463a(7) =252a(8) =0a(9) =129a(10) =168710720a(11) =2360896a(12) =98560a(13) =0a(14) =43968a(17) =18229845000a(18) =474718605a(19) =0a(20) =254429900a(26) =0
External references
- oeis: A391161