A025572 a(n) = T(4n,n), where T is the array defined in A025564.

1, 4, 34, 330, 3381, 35700, 384307, 4193020, 46203670, 513011312, 5730482707, 64324536822, 724966763955, 8198552413800, 92985865982415, 1057267681773972, 12047638469222921, 137547814582468048, 1573060924386848400, 18017644508154675426, 206653990802794950415

Offset

1,2

Links

Table of n, a(n) for n=1..21.

Crossrefs

Sequence in context: A232910 A208215 A337390 * A093137 A332617 A333095

Adjacent sequences: A025569 A025570 A025571 * A025573 A025574 A025575

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 07 2019

Status

approved