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%I #3 Mar 30 2012 16:48:58
%S 0,1,3,7,31,173,1199,9831,93303,1004817,12107795,161367055,2356740567,
%T 37428107645,642165083775,11836940014639,233283750994767,
%U 4895016784086017,108952695421053699,2563927258693534391,63603177623431960239,1658851308207579983341
%N 2-boustrophedon transform (see A059294) of 0, 1, 0, 0, 0, ...
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Jan 25 2001