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 A145127 1 + (144 + (50 + (35 + (10 + n)*n)*n)*n)*n/120. 6

%I

%S 1,3,9,25,61,132,259,470,801,1297,2013,3015,4381,6202,8583,11644,

%T 15521,20367,26353,33669,42525,53152,65803,80754,98305,118781,142533,

%U 169939,201405,237366,278287,324664,377025,435931,501977,575793,658045,749436

%N 1 + (144 + (50 + (35 + (10 + n)*n)*n)*n)*n/120.

%C (1 + 3x+ 9x^2 + ...) = (1 + 3x +6x^2 + 10x^3 + ...) * (1 + 3x^2 + 6x^3 + 10x^4 + ...). [From _Gary W. Adamson_, Jul 27 2010]

%H Vincenzo Librandi, <a href="/A145127/b145127.txt">Table of n, a(n) for n = 0..1000</a>

%F G.f.: (x^4-4*x^3+6*x^2-3*x+1) / (1-x)^6.

%p a := n-> 1+ (144+ (50+ (35+ (10+ n) *n) *n) *n) *n/120: seq (a(n), n=0..40);

%o (MAGMA) [1 + (144 + (50 + (35 + (10 + n)*n)*n)*n)*n/120: n in [0..40]]; // Vincenzo Librandi, May 19 2011

%Y 6th row of A145153. See row 6 of A145140/A145141 for rational coefficients and A145142 for 120 * coefficients of polynomial.

%K nonn

%O 0,2

%A _Alois P. Heinz_, Oct 03 2008

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