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A158527 Sum of squares of consecutive positive noncubes. 1
139, 5997, 78414, 553810, 2677065, 10009839, 31098172, 84004164, 203427495, 451263505, 931565514, 1811000022, 3346004389, 5917977555, 10077955320, 16602342664, 26561396547, 41402273589, 63048577990, 94018466010 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=(1/2)*n*(1 + n)*(1 + 9*n + 27*n^2 + 42*n^3 + 36*n^4 + 18*n^5 + 6*n^6)

EXAMPLE

a(1)=139=2^2+...+7^2, a(2)=9^2+...+26^2.

CROSSREFS

Cf. A048396 Sum of consecutive noncubes.

Sequence in context: A001163 A140791 A175017 * A201174 A188452 A183491

Adjacent sequences:  A158524 A158525 A158526 * A158528 A158529 A158530

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Mar 20 2009

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.