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 A088663 An alternating self-similar sequence of a Sierpinski type with an infinite Pisot root scale. 0
 0, 0, -1, 0, 1, 0, -8, 0, 25, 0, -97, 0, 367, 0, -1398, 0, 5259, 0, -19878, 0, 75319, 0, -285137, 0, 1078711, 0, -4081933, 0, 15449144, 0, -58467488, 0, 221260378, 0, -837337471, 0, 3168858565, 0, -11992319160, 0, 45383925816, 0, -171751869342, 0, 649981903584, 0, -2459806349188, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 COMMENTS Since both 1/n! and (E/(2-E))^n terms can be used to get E, I have mapped the infinite Pisot roots to a self-similar subtractive function like that I used for the factorial. LINKS FORMULA p[n_, k_]=Product[(E/(2-E))^i, {i, 1, n}]/Product[(E/(2-E))^i, {i, Floor[n/2^k], n}] a(n) = Sum[Floor[p[n, k]/(8*p[n-1, k])], {k, 1, 8}] MATHEMATICA p[n_, k_]=Product[(E/(2-E))^i, {i, 1, n}]/Product[(E/(2-E))^i, {i, Floor[n/2^k], n}] digits=80 f[n_]=Sum[Floor[p[n, k]/(8*p[n-1, k])], {k, 1, 8}] at=Table[f[n], {n, 2, digits}] CROSSREFS Cf. A088487 A self similar Sierpinski type chaotic sequence with rate three at eight levels. A088488 A self similar Cantor type sequence with eight levels. Sequence in context: A167347 A028604 A292531 * A291681 A011997 A187162 Adjacent sequences:  A088660 A088661 A088662 * A088664 A088665 A088666 KEYWORD sign,uned AUTHOR Roger L. Bagula, Nov 21 2003 STATUS approved

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Last modified July 22 15:23 EDT 2019. Contains 325224 sequences. (Running on oeis4.)