%I #5 Mar 30 2012 16:47:46
%S 1,7,9,49,126,81,343,1323,1701,729,2401,12348,23814,20412,6561,16807,
%T 108045,277830,357210,229635,59049,117649,907578,2917215,5000940,
%U 4822335,2480058,531441,823543,7411887,28588707,61261515
%N Triangle whose (i,j)-th entry is binomial(i,j)*7^(i-j)*9^j.
%D B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.
%K nonn,tabl,easy
%O 0,2
%A _N. J. A. Sloane_.