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Search: id:A060075
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| 1, 14, 331, 12284, 663061, 49164554, 4798037791, 596372040824, 91991577140521, 17244625801225094, 3861296322290987251, 1017889493782391701364, 312043142223584185393981, 110072908401904868672053634
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Also third diagonal of triangle A060058.
a(n) is n-fold iterated sum of squares with last upper summation index 3 and other upper summation indices j[k]+1, k=2,...,n. See Comments A060061 for the threefold iteration with last upper summation index n.
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FORMULA
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a(n)=A060074(n+2, 2)= A060058(2+n, n).
a(n)=1/4*(A000364(n+1)-A000364(n)) - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2003
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CROSSREFS
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Cf. A000364.
Sequence in context: A035018 A133130 A090598 this_sequence A035273 A020143 A161927
Adjacent sequences: A060072 A060073 A060074 this_sequence A060076 A060077 A060078
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Mar 16 2001
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