A209161 Triangle of coefficients of polynomials v(n,x) jointly generated with A209160; see the Formula section.

1, 1, 4, 1, 6, 10, 1, 8, 24, 28, 1, 10, 42, 88, 76, 1, 12, 64, 188, 300, 208, 1, 14, 90, 336, 760, 984, 568, 1, 16, 120, 540, 1560, 2880, 3136, 1552, 1, 18, 154, 808, 2820, 6672, 10416, 9792, 4240, 1, 20, 192, 1148, 4676, 13392, 26880, 36384, 30096

Offset: 1

Author

Clark Kimberling, Mar 07 2012

Keywords

• nonn
• tabl

Comments

For a discussion and guide to related arrays, see A208510.

Examples

			First five rows:
1
1...4
1...6...10
1...8...24...28
1...10...42...88...76
First three polynomials v(n,x): 1, 1 + 4x, 1 + 6x + 10x^2.
		

Crossrefs

Cf. A209160, A208510.

Programs

Mathematica

u[1, x_] := 1; v[1, x_] := 1; z = 16;
u[n_, x_] := u[n - 1, x] + (x + 1)*v[n - 1, x];
v[n_, x_] := 2 x*u[n - 1, x] + 2 x*v[n - 1, x] + 1;
Table[Expand[u[n, x]], {n, 1, z/2}]
Table[Expand[v[n, x]], {n, 1, z/2}]
cu = Table[CoefficientList[u[n, x], x], {n, 1, z}];
TableForm[cu]
Flatten[%]    (* A209160 *)
Table[Expand[v[n, x]], {n, 1, z}]
cv = Table[CoefficientList[v[n, x], x], {n, 1, z}];
TableForm[cv]
Flatten[%]    (* A209161 *)

Formula

u(n,x)=u(n-1,x)+(x+1)*v(n-1,x),

v(n,x)=2x*u(n-1,x)+2x*v(n-1,x)+1,

where u(1,x)=1, v(1,x)=1.