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”).

A047049
T(2n,n), array T as in A047040.
0
1, 1, 5, 23, 136, 833, 4989, 31065, 196531, 1241950, 7930155, 51007263, 328816452, 2128751494, 13833853223, 90098821854, 588220949445, 3848961945992, 25228405247702, 165629360478917, 1089033236371988, 7169737539803302
OFFSET
0,3
CROSSREFS
Sequence in context: A356010 A244786 A129098 * A351817 A352146 A020034
KEYWORD
nonn
STATUS
approved