Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,1}.
A079991
Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,1}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =13a(6) =29a(7) =58a(8) =124a(9) =280a(10) =632a(11) =1406a(12) =3101a(13) =6851a(14) =15217a(15) =33846a(16) =75181a(17) =166823a(18) =370177a(19) =821760a(20) =1824620a(21) =4051056a(22) =8993220a(23) =19964240a(24) =44320545a(25) =98393849a(26) =218438981a(27) =484939834a(28) =1076573833a(29) =2390015565
External references
- oeis: A079991