Search: id:A137277
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%I A137277
%S A137277 1,0,1,2,0,1,0,1,0,1,6,0,0,0,1,0,6,0,1,0,1,20,0,5,0,2,0,1,0,25,0,3,0,3,
%T A137277 0,1,70,0,28,0,0,0,4,0,1,0,98,0,28,0,4,0,5,0,1,252,0,126,0,24,0,9,0,6,
%U A137277 0,1,0,378,0,150,0,15,0,15,0,7,0,1,924,0,528,0,165,0,0,0,22,0,8,0,1,0,
               1452
%V A137277 1,0,1,2,0,1,0,1,0,1,-6,0,0,0,1,0,-6,0,-1,0,1,20,0,-5,0,-2,0,1,0,25,0,
               -3,0,-3,
%W A137277 0,1,-70,0,28,0,0,0,-4,0,1,0,-98,0,28,0,4,0,-5,0,1,252,0,-126,0,24,0,9,
               0,-6,
%X A137277 0,1,0,378,0,-150,0,15,0,15,0,-7,0,1,-924,0,528,0,-165,0,0,0,22,0,-8,0,
               1,0,-1452
%N A137277 Triangle of the coefficients [x^k] P_n(x) of the polynomials P_n(x) = 
               sum_{j=0..[n/2]} (-1)^j binomial(n,j) (n-4j) x^(n-2j)/n.
%C A137277 The first four P_n(x) are the same as the first four Boubaker Polynomials 
               A137276.
%C A137277 Row sums are 1, 1, 3, 2, -5, -6, 14, 20, -45, -70, 154, a signed variant 
               of A047074.
%F A137277 P(0,n)=1. P_n(x) = sum_{j=0..floor(n/2)} (-1)^j binomial(n,j) (n-4j) 
               x^(n-2j)/n.
%e A137277 {1}, = 1
%e A137277 {0, 1}, = x
%e A137277 {2, 0, 1}, = 2+x^2
%e A137277 {0, 1, 0, 1}, = x+x^3
%e A137277 {-6, 0, 0, 0, 1}, = -6+x^4
%e A137277 {0, -6, 0, -1, 0, 1},
%e A137277 {20, 0, -5, 0, -2, 0, 1},
%e A137277 {0, 25, 0, -3,0, -3, 0, 1},
%e A137277 {-70, 0, 28, 0, 0, 0, -4, 0, 1},
%e A137277 {0, -98, 0, 28, 0,4, 0, -5, 0, 1},
%e A137277 {252, 0, -126, 0, 24, 0, 9, 0, -6, 0, 1}
%p A137277 A137277 := proc(n,k) if n = 0 then 1; else add( (-1)^j*binomial(n,j)*(n-4*j)*x^(n-2*j),
               j=0..n/2)/n ; coeftayl(%,x=0,k) ; fi; end:
%p A137277 seq( seq(A137277(n,k),k=0..n),n=0..15) ;
%t A137277 B[x_, n_] = If[n > 0, Sum[(-1)^p*Binomial[n,p]*(n - 4*p)*x^(n - 2*p)/ 
               n, {p, 0, Floor[n/2]}], 1]; a = Table[CoefficientList[B[x, n], x], 
               {n, 0, 10}]; Flatten[a]
%Y A137277 Cf. A138034.
%Y A137277 Sequence in context: A116927 A137276 A140581 this_sequence A039975 A016253 
               A117188
%Y A137277 Adjacent sequences: A137274 A137275 A137276 this_sequence A137278 A137279 
               A137280
%K A137277 sign,easy,tabl
%O A137277 0,4
%A A137277 Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Mar 13 2008
%E A137277 Edited by the Associate Editors of the OEIS, Aug 27 2009

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