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A194800
Number of grid points that are covered after n-th stage of A139250, assuming the vertical toothpicks have length 2 and the horizontal toothpicks have length 4.
2
0, 3, 11, 17, 31, 39, 67
OFFSET
0,2
COMMENTS
There are an infinite family of these sequences since A139250 gives the number of toothpicks in the structure regardless of the length difference between horizontal toothpicks and vertical toothpicks. Examples: A147614, this sequence, A194802, A160420, etc.
EXAMPLE
a(2) = 11.
o o o o o
. . o . .
o o o o o
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Sep 07 2011
STATUS
approved