The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A167431 Riordan array (1-4x+4x^2, x(1-2x)). 4
 1, -4, 1, 4, -6, 1, 0, 12, -8, 1, 0, -8, 24, -10, 1, 0, 0, -32, 40, -12, 1, 0, 0, 16, -80, 60, -14, 1, 0, 0, 0, 80, -160, 84, -16, 1, 0, 0, 0, -32, 240, -280, 112, -18, 1, 0, 0, 0, 0, -192, 560, -448, 144, -20, 1, 0, 0, 0, 0, 64, -672, 1120, -672, 180, -22, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are A167433. Diagonal sums are A167434. Central coefficients are (-1)^n*A001788(n+1). Inverse is A167432. LINKS FORMULA T(n,k)=T(n-1,k-1)-2*T(n-2,k-1), T(0,0)=1, T(1,0)=-4, T(2,0)=4, T(n,k)=0 if k<0 or if k>n. - Philippe Deléham, Nov 13 2013 EXAMPLE Triangle begins 1, -4, 1, 4, -6, 1, 0, 12, -8, 1, 0, -8, 24, -10, 1, 0, 0, -32, 40, -12, 1, 0, 0, 16, -80, 60, -14, 1, 0, 0, 0, 80, -160, 84, -16, 1, 0, 0, 0, -32, 240, -280, 112, -18, 1, 0, 0, 0, 0, -192, 560, -448, 144, -20, 1, 0, 0, 0, 0, 64, -672, 1120, -672, 180, -22, 1 CROSSREFS Sequence in context: A081773 A324836 A302151 * A205848 A297701 A110361 Adjacent sequences:  A167428 A167429 A167430 * A167432 A167433 A167434 KEYWORD easy,sign,tabl AUTHOR Paul Barry, Nov 03 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 18 03:02 EST 2022. Contains 350410 sequences. (Running on oeis4.)