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).

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

Offset: 1

Author

Omar E. Pol, Jun 26 2014

Keywords

• nonn
• more

Comments

Partial sums of A244363.

Examples

			Illustration of the structure after 7 stages (Contains 50 toothpicks):
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.    _ _ _ _|
.    _ _ _  |_
.    _ _ _|   |_ _
.    _ _  |_ _  | |
.    _ _|_  | | | |
.    _  | | | | | |
.     | | | | | | |
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.     1 2 3 4 5 6 7
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Crossrefs

Cf. A000203, A237270, A237271, A237593, A244360, A244361, A244363, A244370, A244371.

Formula

a(n) = 2*A244360(n).

a(n) = A244370(n)/4. - Omar E. Pol, Oct 18 2014

Extensions

More terms from Omar E. Pol, Oct 18 2014