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Search: id:A045949
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A045949 Triangles in hexagonal matchstick arrangement of side n. +0
1
0, 6, 38, 116, 262, 496, 840, 1314, 1940, 2738, 3730, 4936, 6378, 8076, 10052, 12326, 14920, 17854, 21150, 24828, 28910, 33416, 38368, 43786, 49692, 56106, 63050, 70544, 78610, 87268, 96540, 106446, 117008, 128246, 140182, 152836, 166230 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n) = [ n(14n^2+9n+2)/4 ]

CROSSREFS

Sequence in context: A055713 A060454 A060452 this_sequence A026296 A037499 A037676

Adjacent sequences: A045946 A045947 A045948 this_sequence A045950 A045951 A045952

KEYWORD

nonn

AUTHOR

R. K. Guy

page 1

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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