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A210222
Triangle of coefficients of polynomials v(n,x) jointly generated with A104698; see the Formula section.
2
1, 2, 2, 3, 6, 2, 4, 12, 10, 2, 5, 20, 28, 14, 2, 6, 30, 60, 52, 18, 2, 7, 42, 110, 140, 84, 22, 2, 8, 56, 182, 310, 276, 124, 26, 2, 9, 72, 280, 602, 726, 484, 172, 30, 2, 10, 90, 408, 1064, 1638, 1486, 780, 228, 34, 2, 11, 110, 570, 1752, 3304, 3850, 2750
OFFSET
1,2
COMMENTS
Period of alternating row sums: (1,0,-1,0)
For a discussion and guide to related arrays, see A208510.
FORMULA
u(n,x)=x*u(n-1,x)+v(n-1,x)+1,
v(n,x)=2x*u(n-1,x)+v(n-1,x)+1,
where u(1,x)=1, v(1,x)=1.
EXAMPLE
First five rows:
1
2...2
3...6....2
4...12...10...2
5...20...28...14...2
First three polynomials v(n,x): 1, 2 + 2x , 3 + 6x + 2x^2.
MATHEMATICA
u[1, x_] := 1; v[1, x_] := 1; z = 16;
u[n_, x_] := x*u[n - 1, x] + v[n - 1, x] + 1;
v[n_, x_] := 2 x*u[n - 1, 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[%] (* A104698 *)
Table[Expand[v[n, x]], {n, 1, z}]
cv = Table[CoefficientList[v[n, x], x], {n, 1, z}];
TableForm[cv]
Flatten[%] (* A210222 *)
CROSSREFS
Sequence in context: A083506 A248164 A338993 * A207621 A209157 A284785
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Mar 19 2012
STATUS
approved