%I #10 Nov 08 2024 08:41:15
%S 1,2,4,6,12,36,102,324,972,3190,12610,50254,214510,1000260,4848796,
%T 24798190,134817190
%N 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.
%K nonn,more
%O 1,2
%A _R. H. Hardin_, Aug 15 2010