A026331 a(n) = T(2n-1,n), where T is the array in A026323.

1, 6, 30, 161, 882, 4916, 27729, 157830, 904706, 5215310, 30203901, 175598997, 1024234850, 5990912280, 35126915550, 206399581434, 1215040298106, 7164651246340, 42310256416456, 250194442456101, 1481274328929984, 8779528511274564

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Crossrefs

Sequence in context: A208790 A026112 A038155 * A135490 A345887 A353891

Adjacent sequences: A026328 A026329 A026330 * A026332 A026333 A026334

Keyword

nonn

Author

Clark Kimberling

Status

approved