A121118 - OEIS

%I #7 Jul 31 2019 11:12:23

%S 0,1,2,7,14,47,100,340,756,2605,5972,20799,48750,171218,408088,

%T 1442943,3484480,12388309,30231806,107971435,265768846,952810089,

%U 2362256162,8496532384,21193912716,76443985912,191684088026,693071685268

%N Related to enumeration of rooted catapolyoctagons (see Cyvin reference for precise definition).

%D S. J. Cyvin, B. N. Cyvin, and J. Brunvoll. Enumeration of tree-like octagonal systems: catapolyoctagons, ACH Models in Chem. 134 (1997), 55-70. Table III Z_r.

%F a(n) = Sum_{i=1..n-1} A036759(i)*A036759(n-i) [Cyvin eq. (30)] . - _R. J. Mathar_, Jul 31 2019

%K nonn

%O 1,3

%A _N. J. A. Sloane_, Aug 13, 2006