%I #8 Aug 09 2019 01:59:30
%S 1,1,1,4,9,27,89,304,944,3259,11081,38044,132921,467771,1650279,
%T 5907280,21183657,76488912,277631065,1012588940,3707127319,
%U 13632296219,50292158921,186165033296,691181554768,2573423459611
%N Sum of indices of windows of trapezoidal maps.
%H P. H. Borcherds and G. P. McCauley, <a href="https://doi.org/10.1016/0960-0779(93)90030-5">The digital tent map and trapezoidal map</a>, Chaos, Solitons and Fractals, Vol. 3, pp. 451-66 (1993).
%Y Cf. A007873.
%K nonn,more
%O 1,4
%A Peter H. Borcherds (p.h.borcherds(AT)bham.ac.uk)