Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,4,5} for all i=1,...,n.
A378005
Number of permutations (p(1),p(2),...,p(n)) of (1,2,...,n) such that p(i)-i is in {-2,4,5} for all i=1,...,n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =1a(8) =0a(9) =0a(10) =0a(11) =0a(12) =1a(13) =3a(14) =1a(15) =0a(16) =0a(17) =0a(18) =1a(19) =6a(20) =6a(21) =1a(22) =0a(23) =0a(24) =1a(25) =10a(26) =20a(27) =10a(28) =1a(29) =1
External references
- oeis: A378005