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Search: id:A068792
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| A068792 |
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(n-1)*n^(n-2)+sum{(n-i)*(n^(n-i-1)+n^(n+i-3)) | 1<i<n}. |
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+0
3
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| 1, 16, 441, 24336, 2418025, 384473664, 89755965649, 28953439105600, 12345678987654321, 6727499948806851600, 4562491230669011577289, 3769449794266138309731600, 3727710895159027432980276121
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OFFSET
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2,2
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COMMENT
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a(n)=((A023811(n)-n+1)/n)*n^(n-1)+A062813(n)/n;
a(n)=A060072(n)^2.
a(n) is a palindrome in base n representation for all n.
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FORMULA
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a(n)=((n^(n-1)-1)/(n-1))^2
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EXAMPLE
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a(8) = 89755965649 = (1234567654321)OCT;
a(10) = 12345678987654321 = A057139(9);
a(16) = 5907679981266292758213173560296225 = (123456789ABC...987654321)HEX.
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CROSSREFS
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Cf. A068793.
Sequence in context: A118994 A000489 A075852 this_sequence A113674 A010560 A013825
Adjacent sequences: A068789 A068790 A068791 this_sequence A068793 A068794 A068795
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 04 2002
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