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A244362 Total number of toothpicks after n-th stage in the toothpick structure of the symmetric representation of sigma in the first quadrant (without the axes x and y). 4
2, 6, 12, 20, 28, 40, 50, 66, 82, 102, 116, 140, 156, 182, 208, 240, 260, 296, 318, 358, 394, 432, 458, 506, 540, 584, 628, 684 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Partial sums of A244363.
LINKS
FORMULA
a(n) = 2*A244360(n).
a(n) = A244370(n)/4. - Omar E. Pol, Oct 18 2014
EXAMPLE
Illustration of the structure after 7 stages (Contains 50 toothpicks):
.
. _ _ _ _
. _ _ _ _|
. _ _ _ |_
. _ _ _| |_ _
. _ _ |_ _ | |
. _ _|_ | | | |
. _ | | | | | |
. | | | | | | |
.
. 1 2 3 4 5 6 7
.
CROSSREFS
Sequence in context: A120344 A031426 A258633 * A175967 A254949 A034100
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Jun 26 2014
EXTENSIONS
More terms from Omar E. Pol, Oct 18 2014
STATUS
approved

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Last modified June 21 09:23 EDT 2024. Contains 373542 sequences. (Running on oeis4.)