Number of permutations of 0..(n-1) representable as 1,4,6,4,1-weighted consecutive sums of 5 adjacent elements of a sequence of n+4 nonnegative integers.
A180215
Number of permutations of 0..(n-1) representable as 1,4,6,4,1-weighted consecutive sums of 5 adjacent elements of a sequence of n+4 nonnegative integers.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =12a(17) =48a(18) =176a(19) =444a(20) =420a(21) =2124a(22) =8056a(23) =12944
External references
- oeis: A180215