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 A115634 Expansion of (1-4x^2)/(1-x^2). 2
 1, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0, -3, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Row sums of number triangle A115633. LINKS Index entries for linear recurrences with constant coefficients, signature (0,1). FORMULA a(n)=4*0^n-3*(1+(-1)^n)/2; a(n)=sum{k=0..n, A115633(n, k)}. CROSSREFS Sequence in context: A055240 A174559 A183035 * A010674 A021037 A053387 Adjacent sequences:  A115631 A115632 A115633 * A115635 A115636 A115637 KEYWORD easy,sign AUTHOR Paul Barry, Jan 27 2006 STATUS approved

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