G.f. satisfies: A(x) = A( -x/(1-4*x) ) / sqrt(1-4*x), with A(0)=1.

A264231

G.f. satisfies: A(x) = A( -x/(1-4*x) ) / sqrt(1-4*x), with A(0)=1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =10a(4) =37a(5) =144a(6) =582a(7) =2418a(8) =10266a(9) =44353a(10) =194395a(11) =862308a(12) =3864100a(13) =17466055a(14) =79537815a(15) =364543920a(16) =1680205044a(17) =7782321357a(18) =36202366293a(19) =169056409476a(20) =792157776138

External references