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a(1)=9; a(n)=floor((55+sum(a(1) to a(n-1)))/6).
1

%I #2 Mar 30 2012 18:34:45

%S 9,10,12,14,16,19,22,26,30,35,41,48,56,65,76,89,103,121,141,164,192,

%T 224,261,304,355,414,483,564,658,767,895,1044,1218,1421,1658,1935,

%U 2257,2633,3072,3584

%N a(1)=9; a(n)=floor((55+sum(a(1) to a(n-1)))/6).

%Y Cf. A073941, A112088, A072493.

%K nonn

%O 1,1

%A _Graeme McRae_, Jun 10 2006