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%I #10 Mar 16 2017 19:28:30
%S 1,3,5,7,23,347,109307,11878938227,141106591489900388627,
%T 19911070158545297149320104511797515190627,
%U 396450714858513044552818188364610837019759458190194070051140109393414330800390627
%N a(n) = a(n-1)*b(n-2)+2, b() given by A029758.
%D D. E. Knuth, Art of Computer Programming, Vol. 3, Sect. 6.2.3 (7) and (8).
%H Alois P. Heinz, <a href="/A029846/b029846.txt">Table of n, a(n) for n = 0..13</a>
%o (PARI) a(n)=if(n<3,max(0,1+2*n),2+a(n-1)*(a(n-1)-2)*(a(n-2)-2)/a(n-2)) /* _Michael Somos_, Feb 07 2004 */
%K easy,nonn
%O 0,2
%A _Don Knuth_
%E More terms from _N. J. A. Sloane_
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