Number of permutations of 0..(n-1) representable as consecutive sums of 4 adjacent elements of a sequence of n+3 nonnegative integers.
A180207
Number of permutations of 0..(n-1) representable as consecutive sums of 4 adjacent elements of a sequence of n+3 nonnegative integers.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =34a(6) =82a(7) =252a(8) =890a(9) =3644a(10) =15390a(11) =67646a(12) =301210a(13) =1397898a(14) =6786792a(15) =35154332
External references
- oeis: A180207