A246222 - OEIS

%I #8 Jan 12 2015 09:39:23

%S 99,0,13303,530432,2715243,14872704,712988175,2114735616,14553496947,

%T 22338508875,9307563626682,839345640802598,8486108520773778,

%U 298020352385025000,10432593658200450596,210875469472380711300,944599826416703171100,12667164470975664000000

%N Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive step pattern given by the binary expansion of n, where 1=up and 0=down.

%H Alois P. Heinz, <a href="/A246222/b246222.txt">Table of n, a(n) for n = 7..130</a>

%Y Column k=2 of A242783.

%K nonn

%O 7,1

%A _Alois P. Heinz_, Aug 19 2014