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A130566 Pyramidal 47-gonal numbers. 1
1, 48, 186, 460, 915, 1596, 2548, 3816, 5445, 7480, 9966, 12948, 16471, 20580, 25320, 30736, 36873, 43776, 51490, 60060, 69531, 79948, 91356, 103800, 117325, 131976, 147798, 164836, 183135, 202740, 223696, 246048, 269841, 295120, 321930, 350316, 380323 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

(15 n + 1) (n + 2) (n + 1)/2.

CROSSREFS

Sequence in context: A131683 A066134 A005911 * A157923 A072254 A183683

Adjacent sequences:  A130563 A130564 A130565 * A130567 A130568 A130569

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Oct 06 2007, based on a suggestion from an unknown correspondent in 2004.

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.