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A045950 Triangles in Star of David matchstick arrangement of side n. 0
0, 10, 59, 177, 394, 740, 1245, 1939, 2852, 4014, 5455, 7205, 9294, 11752, 14609, 17895, 21640, 25874, 30627, 35929, 41810, 48300, 55429, 63227, 71724, 80950, 90935, 101709, 113302, 125744, 139065, 153295, 168464, 184602, 201739, 219905 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

n(10n^2 + 9n + 1)/2.

CROSSREFS

Sequence in context: A044148 A044529 A129330 * A061001 A055586 A054489

Adjacent sequences:  A045947 A045948 A045949 * A045951 A045952 A045953

KEYWORD

nonn

AUTHOR

R. K. Guy

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Last modified February 16 01:31 EST 2012. Contains 205860 sequences.