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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

Table of n, a(n) for n=1..28.

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

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

Sequence in context: A120344 A031426 A258633 * A175967 A254949 A034100

Adjacent sequences:  A244359 A244360 A244361 * A244363 A244364 A244365

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 September 23 08:18 EDT 2020. Contains 337295 sequences. (Running on oeis4.)