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%I #9 Mar 21 2023 18:06:52
%S 1,2,6,4,4,40,120,72,140,824,3312,22320,110976,1369536,9477120,
%T 3596160,3235584,36927360,286846848,700001376,3321184800,41563274304,
%U 279121008576,3155690872704,40885093117440,827391601336320,11517247876055040,76396291822448640,822435518222438400
%N Number of permutations where for every pair of adjacent elements one element in binary notation has ones at the same or adjacent positions to those of the other element.
%Y Cf. A115506, A115507, A115509.
%K nonn
%O 1,2
%A _Max Alekseyev_, Jan 31 2006
%E a(21)-a(29) from _Max Alekseyev_, Mar 21 2023