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A066621
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Concatenation of triangular numbers in increasing order up to the n-th and then in decreasing order.
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0
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1, 131, 13631, 13610631, 136101510631, 1361015211510631, 13610152128211510631, 136101521283628211510631, 1361015212836453628211510631, 13610152128364555453628211510631
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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easy,nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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