A026705 T(2n,n-1), T given by A026703.

1, 6, 31, 155, 767, 3780, 18595, 91393, 448981, 2205125, 10828709, 53172183, 261078623, 1281874806, 6293791663, 30901142675, 151716892649, 744889168771, 3657197145041, 17955788884557, 88157703490061, 432828510306195

Offset

1,2

Links

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

Crossrefs

Sequence in context: A056015 A128740 A227505 * A243874 A003463 A026771

Adjacent sequences: A026702 A026703 A026704 * A026706 A026707 A026708

Keyword

nonn

Author

Clark Kimberling

Status

approved