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A068178
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a(1) = 4; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).
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3
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4, 49, 1849, 18496, 1784896, 177848896, 17778488896, 1777784888896, 177777848888896, 17777778488888896, 1777777784888888896, 177777777848888888896, 17777777778488888888896
(list; graph; refs; listen; history; internal format)
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