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A130695 Number of ways to write n as (a+1)(b+1)(c+1) - abc with a, b, c nonnegative integers. 1
1, 3, 3, 6, 3, 9, 4, 9, 6, 12, 3, 15, 6, 12, 9, 15, 3, 21, 7, 15, 9, 18, 6, 24, 9, 15, 9, 24, 6, 30, 6, 15, 15, 24, 9, 30, 7, 21, 12, 30, 3, 33, 15, 21, 15, 24, 6, 39, 12, 27, 12, 27, 9, 42, 12, 21, 15, 36, 6, 45, 13, 18, 21, 36, 12, 39, 6, 33, 15, 45, 9, 42, 12, 24, 24, 30, 9, 57, 18, 30 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Jan Kristian Haugland (jankrihau(AT)hotmail.com), Jul 10 2007, Table of n, a(n) for n = 1..200

EXAMPLE

a(7) = 4 because 7 = 7*1*1-6*0*0 = 1*7*1-0*6*0 = 1*1*7-0*0*6 = 2*2*2-1*1*1.

CROSSREFS

Sequence in context: A151787 A113397 A007425 * A181788 A058587 A112163

Adjacent sequences:  A130692 A130693 A130694 * A130696 A130697 A130698

KEYWORD

nonn

AUTHOR

Jan Kristian Haugland (jankrihau(AT)hotmail.com), Jul 10 2007

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Last modified February 14 19:37 EST 2012. Contains 205663 sequences.