%I #6 Sep 12 2015 11:00:25
%S 1,2,6,24,114,628,4062,30360,251658,2308648,23351268,259031232,
%T 3091784268,39697601392,546982720164,8064677125440
%N Number of ways to place n nonattacking composite pieces rook + semi-rider[4,4] on an n X n chessboard.
%C a(n) is also number of permutations p of 1,2,...,n satisfying p(j+4k)-p(j)<>4k for all j>=1, k>=1, j+4k<=n
%C For information about semi-pieces see semi-bishop (A187235) and semi-queen (A099152).
%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Number of ways of placing non-attacking queens, kings, bishops and knights</a> (in English and Czech)
%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Fairy_chess_piece">Fairy chess piece</a>
%Y Cf. A189283, A099152, A189843, A189844, A189840, A187235
%K nonn,hard
%O 1,2
%A _Vaclav Kotesovec_, Apr 29 2011