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A276474 a(n) = ((sqrt(2); sqrt(2))_n + (-sqrt(2); -sqrt(2))_n)/2, where (q; q)_n is the q-Pochhammer symbol. 6
1, 1, -1, -5, 15, 87, -609, -8337, 125055, 2695455, -83559105, -4212669825, 265398198975, 22347926076735, -2838186611745345, -560679228377509185, 142973203236264842175, 47858338570309251530175, -24455611009428027531919425, -19225279650279123532147010625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The q-Pochhammer symbol (q; q)_n = Product_{k=1..n} (1 - q^k).

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..114

Eric Weisstein's World of Mathematics, q-Pochhammer Symbol.

FORMULA

(sqrt(2); sqrt(2))_n = a(n) + A276475(n)*sqrt(2).

(-sqrt(2); -sqrt(2))_n = a(n) - A276475(n)*sqrt(2).

MATHEMATICA

Round@Table[(QPochhammer[Sqrt[2], Sqrt[2], n] + QPochhammer[-Sqrt[2], -Sqrt[2], n])/2, {n, 0, 20}]

CROSSREFS

Cf. A276475, A263687, A263688.

Sequence in context: A058820 A054363 A211944 * A184438 A134135 A292279

Adjacent sequences:  A276471 A276472 A276473 * A276475 A276476 A276477

KEYWORD

sign

AUTHOR

Vladimir Reshetnikov, Sep 12 2016

STATUS

approved

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Last modified April 23 14:15 EDT 2019. Contains 322386 sequences. (Running on oeis4.)