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A112422 Number of 6-element subsets of {1,2,3,...,n} for which the sum-set has 13 elements. 0
3, 11, 19, 27, 35, 43, 54, 65, 81, 97, 113, 129, 148, 167, 186, 210, 234, 258, 285, 312, 339, 366, 398 (list; graph; refs; listen; history; internal format)
OFFSET

7,1

FORMULA

3x^7/((1-x)^2(1-x^6))+5x^8(1-x)^2(1-x^7))

CROSSREFS

Sequence in context: A043433 A078583 A017101 * A125994 A137295 A038536

Adjacent sequences:  A112419 A112420 A112421 * A112423 A112424 A112425

KEYWORD

nonn

AUTHOR

David S Newman (DavidSNewman(AT)hotmail.com), Dec 10 2005

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Last modified February 16 15:54 EST 2012. Contains 205932 sequences.