A061482 -id:A061482 - cp's OEIS frontend

A061902 Number of digits in n-th term of A061482.

1, 1, 1, 2, 3, 5, 9, 17, 34, 68, 135, 270, 539, 1078, 2156, 4311, 8621, 17242, 34484, 68967, 137934, 275867, 551733, 1103466, 2206932, 4413864, 8827727

Offset: 1

Asher Auel, May 05 2001

It appears that either a(n+1) = 2 * a(n) or 2 * a(n) - 1, where this alternation takes on the pattern -1, -1, 0, -1, -1, -1, -1, 0, 0, -1, 0, -1, 0, 0, -1, -1, 0, 0, -1, 0, -1, ...

Cf. A055642, A061482.

a(n) = A055642(A061482(n)). - Michel Marcus, Mar 13 2023

a(23)-a(27) from Sean A. Irvine, Mar 12 2023

A203903 a(n)=f(a(1),a(2),...,a(n-1)), where f=(n-2)-nd elementary symmetric function and a(1)=1, a(2)=1, a(3)=1.

Original entry on oeis.org

1, 1, 1, 3, 10, 103, 10639, 113191411, 12812295557045431, 164154917441086094769014370809371, 26946836920089791747880319422619013022132207748812110372395151551

Offset: 1

Clark Kimberling, Jan 07 2012

nonn

The same recurrence applied to initial values
a(1)=1, a(2)=1, a(3)=2 yields A057438.
The same recurrence applied to initial values
a(1)=1, a(2)=2, a(3)=3 yields A061482.

Cf. A057438, A061482.

a[1] = 1; a[2] = 1; a[3] = 1;
t[3] = {a[1], a[2], a[3]};
a[n_] := SymmetricPolynomial[n - 2, t[n - 1]]
t[n_] := Append[t[n - 1], {a[n]}]
Flatten[Table[a[n], {n, 1, 12}]]  (* A203903 *)

cp's OEIS Frontend

A061902 Number of digits in n-th term of A061482.

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