login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A026091
a(n) = T(4n,n), where T is the array defined in A026082.
0
1, 1, 18, 183, 1927, 20655, 224498, 2465815, 27304863, 304313548, 3409370698, 38362211823, 433219457730, 4907408334066, 55737813431070, 634528087334283, 7238225267825429, 82716464152842756, 946771870186411896, 10852263461880981957
OFFSET
0,3
CROSSREFS
Sequence in context: A155669 A160954 A160955 * A178260 A296778 A155665
KEYWORD
nonn
STATUS
approved