%I #16 Mar 21 2023 09:07:02
%S 1,2,6,8,24,168,840,1008,4032,32160,192960,1297440,9082080,126846720,
%T 1141620480,1243468800,4490307360,53812332000,526257365760,
%U 3736568586240,33629117276160,539852417395200,5938376591347200,43328496719692800,612865454506905600,12864962752408166400,204270526971128217600,2666714307922074009600,40000714618831110144000
%N Number of permutations where every element in binary notation has ones at the same or adjacent positions of previous element's binary ones.
%C Suggested by _Leroy Quet_.
%Y Cf. A115507, A115508, A115509.
%K nonn
%O 1,2
%A _Max Alekseyev_, Jan 31 2006
%E a(21)-a(29) from _Max Alekseyev_, Mar 21 2023