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A128417 Number triangle T(n,k)=2^(n-k)*C(2n,n-k). +0
5
1, 4, 1, 24, 8, 1, 160, 60, 12, 1, 1120, 448, 112, 16, 1, 8064, 3360, 960, 180, 20, 1, 59136, 25344, 7920, 1760, 264, 24, 1, 439296, 192192, 64064, 16016, 2912, 364, 28, 1, 3294720, 1464320 (list; table; graph; listen)
OFFSET

0,2

COMMENT

Inverse of A128414. Row sums are A128418. Diagonal sums are A128419.

FORMULA

Riordan array (1/sqrt(1-8x),(1-4x-sqrt(1-8x)/(8x)); T(n,k)=2^(n-k)*A094527(n,k).

EXAMPLE

1,

4, 1,

24, 8, 1,

160, 60, 12, 1,

1120, 448, 112, 16, 1,

8064, 3360, 960, 180, 20, 1,

59136, 25344, 7920, 1760, 264, 24, 1,

439296, 192192, 64064, 16016, 2912, 364, 28, 1

CROSSREFS

Cf. A128413.

Sequence in context: A057869 A166027 A158978 this_sequence A136232 A079621 A046860

Adjacent sequences: A128414 A128415 A128416 this_sequence A128418 A128419 A128420

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 02 2007

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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