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a(n+1) is next smallest nontrivial square containing a(n) as a substring, initial term is 9.
3

%I #11 Oct 15 2019 00:02:47

%S 9,49,1849,18496,103184964,7383508103184964,

%T 544680602158273835081031849649

%N a(n+1) is next smallest nontrivial square containing a(n) as a substring, initial term is 9.

%F a(n) = A050633(n)^2.

%Y Starting with a(2)=49, the sequence is identical to A050630.

%Y Cf. A050633, A048561, A050638.

%K nonn,base,more

%O 1,1

%A _Patrick De Geest_, Jul 15 1999

%E a(7) from _Max Alekseyev_, Feb 15 2012