Triangle read by rows: T(n,r), 0 <= r <= n, is the number of idempotents of rank r in the twisted planar partition monoid PP_n^tau.
A289620
Triangle read by rows: T(n,r), 0 <= r <= n, is the number of idempotents of rank r in the twisted planar partition monoid PP_n^tau.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =5a(5) =1a(6) =0a(7) =33a(8) =10a(9) =1a(10) =0a(11) =253a(12) =93a(13) =15a(14) =1a(15) =0a(16) =2147a(17) =880a(18) =178a(19) =20a(20) =1a(21) =0a(22) =19593a(23) =8599a(24) =1982a(25) =288a(26) =25a(27) =1a(28) =0a(29) =188837
External references
- oeis: A289620