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A264666 Triangle of partial row products of A264662. 2

%I #4 Nov 20 2015 23:27:49

%S 2,2,6,2,10,30,2,10,30,210,2,10,30,330,2310,2,10,130,390,4290,30030,2,

%T 34,170,2210,6630,72930,510510,2,34,170,2210,6630,125970,1385670,

%U 9699690,2,34,170,2210,6630,125970,1385670,9699690,223092870,2,34,170,2210

%N Triangle of partial row products of A264662.

%C T(n,1) = A264662(n,1) and T(n,k) = A264662(n,k) * T(n,k-1), k=2..n;

%C T(n,n) = A002110(n).

%H Reinhard Zumkeller, <a href="/A264666/b264666.txt">Rows n = 1..125 of triangle, flattened</a>

%e . 1: 2

%e . 2: 2, 6

%e . 3: 2,10, 30

%e . 4: 2,10, 30, 210

%e . 5: 2,10, 30, 330, 2310

%e . 6: 2,10,130, 390, 4290, 30030

%e . 7: 2,34,170,2210, 6630, 72930, 510510

%e . 8: 2,34,170,2210, 6630,125970,1385670, 9699690

%e . 9: 2,34,170,2210, 6630,125970,1385670, 9699690,223092870

%e . 10: 2,34,170,2210,64090,192270,3653130,40184430,281291010,6469693230 .

%o (Haskell)

%o a264666 n k = a264666_tabl !! (n-1) !! (n-1)

%o a264666_row n = a264666_tabl !! (n-1)

%o a264666_tabl = map (scanl1 (*)) a264662_tabl

%Y Cf. A264662, A002110.

%K nonn,tabl

%O 1,1

%A _Reinhard Zumkeller_, Nov 20 2015

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Last modified March 29 05:16 EDT 2024. Contains 371264 sequences. (Running on oeis4.)