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A211974
Number of E-toothpicks added at n-th stage in the structure of A161336.
2
0, 1, 1, 1, 3, 1, 3, 3, 3, 5, 3, 5, 7, 1, 3, 3, 5, 9, 5, 13, 7, 9, 13, 7, 11, 13, 3, 7, 7, 9, 15, 11, 21, 15, 15, 17, 11, 13, 15, 15, 15, 9, 11, 19, 13, 21, 21, 17, 17, 23, 17, 27, 17, 19, 27, 21, 27, 19, 17, 17, 21, 31, 31, 25, 23
OFFSET
0,5
COMMENTS
Essentially the first differences of A161336.
FORMULA
a(n) = A161331(n+1)/6, n >= 1.
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2012
STATUS
approved