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