A210195 Triangle of coefficients of polynomials u(n,x) jointly generated with A210196; see the Formula section.

1, 3, 5, 4, 7, 12, 8, 9, 24, 32, 16, 11, 40, 80, 80, 32, 13, 60, 160, 240, 192, 64, 15, 84, 280, 560, 672, 448, 128, 17, 112, 448, 1120, 1792, 1792, 1024, 256, 19, 144, 672, 2016, 4032, 5376, 4608, 2304, 512, 21, 180, 960, 3360, 8064, 13440, 15360

Offset: 1

Author

Clark Kimberling, Mar 18 2012

Keywords

• nonn
• tabf

Comments

Row sums: powers of 3

Periodic alternating row sums: 1,3,1,3,1,3,1,3,...

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

Examples

			First five rows:
1
3
5...4
7...12...8
9...24...32...16
First three polynomials u(n,x): 1, 3, 5 + 4x.
		

Crossrefs

Cf. A210196, A208510.

Programs

Mathematica

u[1, x_] := 1; v[1, x_] := 1; z = 16;
u[n_, x_] := u[n - 1, x] + v[n - 1, x] + 1;
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[%]   (* A210195 *)
Table[Expand[v[n, x]], {n, 1, z}]
cv = Table[CoefficientList[v[n, x], x], {n, 1, z}];
TableForm[cv]
Flatten[%]   (* A210196 *)

Formula

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

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

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