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A228146 Triangle T(n,k), read by rows: T(n,k) is the numerator of (1+2^(n-k+1))/(1-2^(k+1)). 2
-3, -5, -1, -9, -5, -3, -17, -3, -5, -1, -33, -17, -9, -1, -3, -65, -11, -17, -3, -5, -1, -129, -65, -33, -17, -9, -5, -3, -257, -43, -65, -11, -17, -1, -5, -1, -513, -257, -129, -13, -33, -17, -9, -1, -3, -1025, -171, -257, -43, -65, -11, -17, -3, -5, -1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The denominators are given in A228147.

LINKS

Vincenzo Librandi, Rows n = 0..90, flattened

EXAMPLE

Triangle begins:

-3;

-5,    -1;

-9,    -5,   -3;

-17,   -3,   -5,   -1;

-33,   -17,  -9,   -1,  -3;

-65,   -11,  -17,  -3,  -5,  -1;

-129,  -65,  -33,  -17, -9,  -5,  -3;

-257,  -43,  -65,  -11, -17, -1,  -5,  -1;

-513,  -257, -129, -13, -33, -17, -9,  -1, -3;

-1025, -171, -257, -43, -65, -11, -17, -3, -5, -1; etc.

MATHEMATICA

a[n_, k_] := Numerator[(1 + 2^(n - k + 1))/(1 - 2^(k + 1))]; Table[a[n, k], {n, 0, 10}, {k, 0, n}] // Flatten

PROG

(MAGMA) [Numerator((1+2^(n-k+1))/(1-2^(k+1))): k in [0..n], n in [0..10]];

CROSSREFS

Cf. A228147.

Sequence in context: A320386 A112411 A283838 * A241674 A021970 A115335

Adjacent sequences:  A228143 A228144 A228145 * A228147 A228148 A228149

KEYWORD

sign,tabl

AUTHOR

Vincenzo Librandi, Aug 15 2013

STATUS

approved

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Last modified June 16 10:03 EDT 2019. Contains 324152 sequences. (Running on oeis4.)