A025571 a(n) = T(3n,n), where T is the array defined in A025564.

1, 3, 19, 140, 1090, 8749, 71604, 593997, 4976785, 42016975, 356879250, 3046096983, 26105109424, 224485080580, 1936029865870, 16738879226139, 145041018993018, 1259189426140919, 10950454909118725, 95374995078513150, 831822673255797630, 7263789225782699928

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Crossrefs

Sequence in context: A073515 A074559 A027314 * A221266 A082758 A110525

Adjacent sequences: A025568 A025569 A025570 * A025572 A025573 A025574

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 07 2019

Status

approved