Central coefficients of triangle A210658.

A210670

Central coefficients of triangle A210658.

Terms

    a(0) =1a(1) =3a(2) =21a(3) =193a(4) =2047a(5) =23691a(6) =290447a(7) =3707655a(8) =48759741a(9) =656041801a(10) =8987420549a(11) =124936234413

External references