A180213 Number of permutations of 0..(n-1) representable as 1,2,1-weighted consecutive sums of 3 adjacent elements of a sequence of n+2 nonnegative integers

1, 2, 4, 6, 12, 36, 102, 324, 972, 3190, 12610, 50254, 214510, 1000260, 4848796, 24798190, 134817190

Offset

1,2

Links

Table of n, a(n) for n=1..17.

Crossrefs

Sequence in context: A309039 A087902 A282193 * A081457 A261206 A361295

Adjacent sequences: A180210 A180211 A180212 * A180214 A180215 A180216

Keyword

nonn

Author

R. H. Hardin Aug 15 2010

Status

approved