A264666 Triangle of partial row products of A264662.

2, 2, 6, 2, 10, 30, 2, 10, 30, 210, 2, 10, 30, 330, 2310, 2, 10, 130, 390, 4290, 30030, 2, 34, 170, 2210, 6630, 72930, 510510, 2, 34, 170, 2210, 6630, 125970, 1385670, 9699690, 2, 34, 170, 2210, 6630, 125970, 1385670, 9699690, 223092870, 2, 34, 170, 2210

Offset

1,1

Comments

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

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

Links

Reinhard Zumkeller, Rows n = 1..125 of triangle, flattened

Example

.  1:  2
.  2:  2, 6
.  3:  2,10, 30
.  4:  2,10, 30, 210
.  5:  2,10, 30, 330, 2310
.  6:  2,10,130, 390, 4290, 30030
.  7:  2,34,170,2210, 6630, 72930, 510510
.  8:  2,34,170,2210, 6630,125970,1385670, 9699690
.  9:  2,34,170,2210, 6630,125970,1385670, 9699690,223092870
. 10:  2,34,170,2210,64090,192270,3653130,40184430,281291010,6469693230 .

Prog

(Haskell)
a264666 n k = a264666_tabl !! (n-1) !! (n-1)
a264666_row n = a264666_tabl !! (n-1)
a264666_tabl = map (scanl1 (*)) a264662_tabl

Crossrefs

Cf. A264662, A002110.

Sequence in context: A352597 A110765 A176991 * A283362 A337524 A324047

Adjacent sequences: A264663 A264664 A264665 * A264667 A264668 A264669

Keyword

nonn,tabl

Author

Reinhard Zumkeller, Nov 20 2015

Status

approved