Expansion of (1-x)*(1-3*x)*(1-3*x+x^2)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

A224514

Expansion of (1-x)*(1-3*x)*(1-3*x+x^2)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =20a(4) =70a(5) =251a(6) =911a(7) =3327a(8) =12190a(9) =44744a(10) =164407a(11) =604487a(12) =2223504a(13) =8181175a(14) =30108147a(15) =110820165a(16) =407946421a(17) =1501844193a(18) =5529362694a(19) =20358557249a(20) =74961030414a(21) =276017648570

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