A210199 Triangle of coefficients of polynomials u(n,x) jointly generated with A210200; see the Formula section.

1, 3, 6, 2, 11, 7, 2, 19, 19, 9, 2, 32, 44, 30, 11, 2, 53, 94, 83, 43, 13, 2, 87, 190, 207, 137, 58, 15, 2, 142, 370, 480, 387, 208, 75, 17, 2, 231, 701, 1057, 1004, 653, 298, 94, 19, 2, 375, 1301, 2238, 2448, 1865, 1026, 409, 115, 21, 2, 608, 2376, 4596

Offset: 1

Author

Clark Kimberling, Mar 18 2012

Keywords

• nonn
• tabf

Comments

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

Examples

			First five rows:
1
3
6....2
11...7....2
19...19...9...2
First three polynomials u(n,x): 1, 3, 6 + 2x.
		

Crossrefs

Cf. A210200, 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_] := (x + 1)*u[n - 1, x] + 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[%]   (* A210199 *)
Table[Expand[v[n, x]], {n, 1, z}]
cv = Table[CoefficientList[v[n, x], x], {n, 1, z}];
TableForm[cv]
Flatten[%]  (* A210200 *)

Formula

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

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

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