Number T(n,k) of derangements of [n] having exactly k peaks; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/2)), read by rows.
A303564
Number T(n,k) of derangements of [n] having exactly k peaks; triangle T(n,k), n>=0, 0<=k<=max(0,floor((n-1)/2)), read by rows.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =3a(6) =6a(7) =5a(8) =33a(9) =6a(10) =11a(11) =152a(12) =102a(13) =21a(14) =663a(15) =1068a(16) =102a(17) =43a(18) =2778a(19) =9060a(20) =2952a(21) =85a(22) =11413a(23) =68250a(24) =50796a(25) =2952a(26) =171a(27) =46332a(28) =477978a(29) =679368
External references
- oeis: A303564