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A022269
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a(n) = n*(11*n+1)/2.
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12
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0, 6, 23, 51, 90, 140, 201, 273, 356, 450, 555, 671, 798, 936, 1085, 1245, 1416, 1598, 1791, 1995, 2210, 2436, 2673, 2921, 3180, 3450, 3731, 4023, 4326, 4640, 4965, 5301, 5648, 6006, 6375, 6755, 7146, 7548, 7961, 8385, 8820, 9266, 9723, 10191, 10670, 11160
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) with n>2, a(0)=0, a(1)=6, a(2)=23. - Philippe Deléham, Mar 27 2013
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MATHEMATICA
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Table[n*(11*n + 1)/2, {n, 0, 50}] (* G. C. Greubel, Aug 24 2017 *)
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PROG
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CROSSREFS
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Cf. similar sequences listed in A022289.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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