A025573 a(n) = T(2n,n-1), where T is the array defined in A025564.

1, 4, 19, 98, 526, 2892, 16159, 91338, 520794, 2989688, 17256275, 100046894, 582204290, 3398722420, 19894375665, 116724946350, 686260868346, 4042058735880, 23846068472626, 140882925528892, 833421929615236, 4936088399361876, 29266184138206509, 173689743532678182

Offset

1,2

Links

Table of n, a(n) for n=1..24.

Crossrefs

Sequence in context: A217217 A083315 A301417 * A006194 A047099 A211855

Adjacent sequences: A025570 A025571 A025572 * A025574 A025575 A025576

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 07 2019

Status

approved