A296218 -id:A296218 - cp's OEIS frontend

A296217 Solution of the complementary equation a(n) = a(1)b(n-2) + a(2)b(n-3) + ... + a(n-1)*b(0), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.

1, 2, 6, 26, 112, 484, 2088, 9008, 38862, 167658, 723308, 3120486, 13462360, 58079138, 250564260, 1080981064, 4663554414, 20119445656, 86799050160, 374467330636, 1615522076050, 6969664279584, 30068434774274, 129720849313094, 559639996988064, 2414391579204576

Offset: 0

Clark Kimberling, Dec 08 2017

The increasing complementary sequences a() and b() are uniquely determined by the titular equation and initial values. See A295862 for a guide to related sequences.

			a(0) =1, a(1) = 2, b(0) = 3, b(1) = 4, b(2) = 4
a(2) = a(1)*b(0) = 2
Complement: (b(n)) = (3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, ...)

Clark Kimberling, Complementary equations, J. Int. Seq. 19 (2007), 1-13.

Cf. A296000, A296218.

a[0] = 1; a[1] = 2; b[0] = 3;
a[n_] := a[n] = Sum[a[k]*b[n - k - 1], {k, 1, n - 1}];
b[n_] := b[n] = mex[Flatten[Table[Join[{a[n]}, {a[i], b[i]}], {i, 0, n - 1}]]];
u = Table[a[n], {n, 0, 200}];  (* A296217 *)
Table[b[n], {n, 0, 20}]
N[Table[a[n]/a[n - 1], {n, 1, 200, 10}], 200];
RealDigits[Last[t], 10][[1]] (* A296218 *)

A296216 Decimal expansion of the limiting ratio of terms in A296215.

Original entry on oeis.org

3, 6, 6, 7, 7, 5, 9, 7, 1, 7, 2, 4, 6, 5, 8, 5, 5, 2, 4, 6, 7, 0, 1, 8, 7, 1, 3, 2, 7, 2, 4, 2, 0, 8, 5, 4, 4, 0, 7, 4, 0, 1, 0, 7, 4, 6, 0, 9, 5, 0, 2, 0, 6, 5, 5, 6, 3, 7, 5, 6, 4, 7, 4, 5, 6, 7, 3, 8, 3, 1, 5, 4, 1, 7, 9, 3, 7, 0, 4, 5, 8, 4, 1, 2, 6, 2

Offset: 1

Clark Kimberling, Dec 08 2017

			A296215(n)/A296215(n-1) -> 3.667759717...
See A296000 for a guide to related sequences and limiting ratios.

Cf. A296000, A296215, A296218.

a[0] = 1; a[1] = 3; b[0] = 2;
a[n_] := a[n] = Sum[a[k]*b[n - k - 1], {k, 1, n - 1}];
b[n_] := b[n] = mex[Flatten[Table[Join[{a[n]}, {a[i], b[i]}], {i, 0, n - 1}]]];
u = Table[a[n], {n, 0, 200}];  (* A296215 *)
Table[b[n], {n, 0, 20}]
N[Table[a[n]/a[n - 1], {n, 1, 200, 10}], 200];
RealDigits[Last[t], 10][[1]]    (* A296216 *)

cp's OEIS Frontend

A296217 Solution of the complementary equation a(n) = a(1)b(n-2) + a(2)b(n-3) + ... + a(n-1)*b(0), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.

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A296216 Decimal expansion of the limiting ratio of terms in A296215.

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cp's OEIS Frontend

A296217 Solution of the complementary equation a(n) = a(1)*b(n-2) + a(2)*b(n-3) + ... + a(n-1)*b(0), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Mathematica

A296216 Decimal expansion of the limiting ratio of terms in A296215.

Views

Author

Keywords

Examples

Crossrefs

Programs

Mathematica

A296217 Solution of the complementary equation a(n) = a(1)b(n-2) + a(2)b(n-3) + ... + a(n-1)*b(0), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.