Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,3,4} for all i=1,...,n.
A377715
Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,3,4} for all i=1,...,n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =0a(8) =0a(9) =0a(10) =1a(11) =3a(12) =1a(13) =0a(14) =0a(15) =1a(16) =6a(17) =6a(18) =1a(19) =1a(20) =1a(21) =10a(22) =20a(23) =10a(24) =5a(25) =6a(26) =15a(27) =50a(28) =50a(29) =25
External references
- oeis: A377715