A026294 T(4n,n), where T is the array in A026268.

1, 3, 27, 266, 2743, 29068, 313633, 3427358, 37810605, 420193609, 4696967294, 52753182426, 594829939672, 6729488070844, 76349568744149, 868359048628146, 9897485221142239, 113024337104850132, 1292850211089736299, 14810711124377556034, 169898355365054443380

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Cf. A026268.

Sequence in context: A370620 A373818 A378612 * A199688 A275998 A098401

Adjacent sequences: A026291 A026292 A026293 * A026295 A026296 A026297

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 24 2019

Status

approved