A026091 a(n) = T(4n,n), where T is the array defined in A026082.

1, 1, 18, 183, 1927, 20655, 224498, 2465815, 27304863, 304313548, 3409370698, 38362211823, 433219457730, 4907408334066, 55737813431070, 634528087334283, 7238225267825429, 82716464152842756, 946771870186411896, 10852263461880981957

Offset

0,3

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A155669 A160954 A160955 * A178260 A296778 A155665

Adjacent sequences: A026088 A026089 A026090 * A026092 A026093 A026094

Keyword

nonn

Author

Clark Kimberling

Status

approved