Number of permutations of 0..(n-1) representable as 1,3,3,1-weighted consecutive sums of 4 adjacent elements of a sequence of n+3 nonnegative integers.
A180214
Number of permutations of 0..(n-1) representable as 1,3,3,1-weighted consecutive sums of 4 adjacent elements of a sequence of n+3 nonnegative integers.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =2a(4) =2a(5) =2a(6) =4a(7) =26a(8) =38a(9) =92a(10) =186a(11) =356a(12) =938a(13) =2682a(14) =7032a(15) =25282a(16) =82022a(17) =212058a(18) =772436
External references
- oeis: A180214