A087164 Records in A087162: A087162(a(n))=n.

1, 2, 3, 7, 23, 91, 383, 1639, 7043, 30295, 130343, 560827, 2413103, 10383031, 44675843, 192230119, 827123063, 3558924955, 15313255583

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Formula

G.f.: (1-4x-x^2+2x^3-x^4)/(1-6x+8x^2-3x^3).

Crossrefs

Cf. A087162.

Sequence in context: A133429 A087770 A237359 * A077213 A112601 A181609

Adjacent sequences: A087161 A087162 A087163 * A087165 A087166 A087167

Keyword

nonn

Author

Paul D. Hanna, Aug 22 2003

Status

approved