A026892 T(2n,n-4), T given by A026780.

1, 19, 220, 2021, 16246, 119914, 835080, 5579147, 36150820, 228879616, 1423367610, 8727874180, 52919787978, 317969615146, 1896431659490, 11241964305405, 66305996581006, 389432443869294, 2279159225280808

Offset

4,2

Links

Table of n, a(n) for n=4..22.

Crossrefs

Sequence in context: A367980 A009474 A045492 * A142487 A022743 A370147

Adjacent sequences: A026889 A026890 A026891 * A026893 A026894 A026895

Keyword

nonn

Author

Clark Kimberling

Status

approved