Number of permutations (p(1), p(2), ..., p(n)) satisfying -k <= p(i)-i <= r and p(i)-i not in the set I, i=1..n, with k=2, r=4, I={-1,1,2,3}.
A224809
Number of permutations (p(1), p(2), ..., p(n)) satisfying -k <= p(i)-i <= r and p(i)-i not in the set I, i=1..n, with k=2, r=4, I={-1,1,2,3}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =4a(7) =6a(8) =9a(9) =12a(10) =16a(11) =24a(12) =36a(13) =54a(14) =81a(15) =117a(16) =169a(17) =247a(18) =361a(19) =532a(20) =784a(21) =1148a(22) =1681a(23) =2460a(24) =3600a(25) =5280a(26) =7744a(27) =11352a(28) =16641a(29) =24381
External references
- oeis: A224809