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EXAMPLE
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E.g.f.: A(x) = x + 3*x^2/2! + 70*x^3/3! + 4515*x^4/4! + 567576*x^5/5! + 116389295*x^6/6! + 35111089728*x^7/7! + 14574226069095*x^8/8! + 7944376570503040*x^9/9! + 5494208894263886139*x^10/10! + ...
ILLUSTRATION OF DEFINITION.
The table of coefficients of x^k/k! in (1 + n*x - A(x))^(2*n) begins:
n=0: [1, 0, 0, 0, 0, 0, 0, 0, ...];
n=1: [1, 0, -6, -140, -8976, -1130952, -232274240, -70128541380, ...];
n=2: [1, 4, 0, -364, -21504, -2530284, -504753152, -149907313980, ...];
n=3: [1, 12, 102, 0, -45960, -5063916, -928551600, -263868802728, ...];
n=4: [1, 24, 480, 7000, 0, -9924168, -1748523008, -457324971720, ...];
n=5: [1, 40, 1410, 42140, 939360, 0, -3259331360, -836926230780, ...];
n=6: [1, 60, 3264, 158220, 6595584, 208807788, 0, -1509806731620, ...];
n=7: [1, 84, 6510, 460936, 29355816, 1626947196, 69489455728, 0, ...]; ...
in which the main diagonal is all zeros after the initial term, illustrating that [x^n] (1 + n*x - A(x))^(2*n) = 0, for n > 0.
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