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={2}.
A079995
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={2}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =14a(5) =39a(6) =103a(7) =255a(8) =665a(9) =1741a(10) =4605a(11) =12046a(12) =31474a(13) =82206a(14) =215157a(15) =563083a(16) =1473635a(17) =3855111a(18) =10085589a(19) =26386595a(20) =69038554a(21) =180630858a(22) =472594580a(23) =1236463719a(24) =3235013481a(25) =8463923170a(26) =22144596592a(27) =57937977232a(28) =151585883920
External references
- oeis: A079995