Number of permutations of 0..(n-1) representable as consecutive sums of 3 adjacent elements of a sequence of n+2 nonnegative integers.
A180206
Number of permutations of 0..(n-1) representable as consecutive sums of 3 adjacent elements of a sequence of n+2 nonnegative integers.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =18a(5) =56a(6) =206a(7) =866a(8) =3662a(9) =16304a(10) =77448a(11) =405594a(12) =2296514a(13) =13989280a(14) =89990314a(15) =612195224
External references
- oeis: A180206