A159755 - OEIS

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A159755

Triangle of C. A. Laisant for k<=0 (see A062111 and A152920).

1

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

(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 ; -2,-1,4 ; -3,-3,0,12 ; -4,-5,-4,4,32 ; ...

CROSSREFS

Sequence in context: A093067 A098122 A159931 * A215534 A368705 A304573

Adjacent sequences: A159752 A159753 A159754 * A159756 A159757 A159758

KEYWORD

sign,tabl

AUTHOR

Philippe Deléham, Apr 21 2009

STATUS

approved