A159756 - OEIS

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A159756

Triangle A159755 reversed .

0

0, 1, -1, 4, -1, -2, 12, 0, -3, -3, 32, 4, -4, -5, -4, 80, 16, -4, -8, -7, -5, 192, 48, 0, -12, -12, -9, -6, 448, 128, 16, -16, -20, -16, -11, -7, 1024, 320, 64, -16, -32, -28, -20, -13, -8, 2304, 768, 192, 0, -48, -48, -36, -24, -15, -9

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Table of n, a(n) for n=0..54.

FORMULA

Sum_{k=0..n} T(n,k) = A045618(n-2) for n>=2 . T(2n,n)=-A001787(n).

EXAMPLE

Triangle begins : 0 ; 1,-1 ; 4,-1,-2 ; 12,0,-3,-3 ; 32,4,-4,-5,-4 ; ...

CROSSREFS

Cf. A062111, A152920

Sequence in context: A280440 A024569 A206692 * A110559 A365455 A030441

Adjacent sequences: A159753 A159754 A159755 * A159757 A159758 A159759

KEYWORD

sign,tabl

AUTHOR

Philippe Deléham, Apr 21 2009

STATUS

approved