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Products of pairs made by match-making permutation: a(n) = A266195(n) * A266195(n+1).
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%I #8 Dec 29 2015 03:26:22

%S 2,6,12,20,30,48,56,63,90,120,192,176,187,221,416,448,252,360,380,627,

%T 495,510,748,1408,1344,504,864,1008,1820,1495,1518,1650,1000,1400,

%U 2520,3024,2016,1776,2516,1768,3328,3456,3483,3741,3770,3900,3960,4092,7936,9728,3040,3920,3577,4088,7616,5576,3936,6624,9936,9648,5628,8148,13289

%N Products of pairs made by match-making permutation: a(n) = A266195(n) * A266195(n+1).

%H Antti Karttunen, <a href="/A266194/b266194.txt">Table of n, a(n) for n = 1..2693</a>

%F a(n) = A266195(n) * A266195(n+1).

%F a(n) = A048720(A266195(n), A266195(n+1)).

%F a(n) = A057889(A057889(A266195(n)) * A057889(A266195(n+1))). [See the comment in A266351.]

%o (Scheme, two variants)

%o (define (A266194 n) (* (A266195 n) (A266195 (+ n 1))))

%o (define (A266194 n) (A048720bi (A266195 n) (A266195 (+ n 1)))) ;; A048720bi implements the carryless binary multiplication, specified in A048720.

%Y Cf. A048720, A057889, A266195, A266351.

%K nonn,base

%O 1,1

%A _Antti Karttunen_, Dec 26 2015