A290446 a(n) = Bell(n)*Motzkin(n-1).

1, 2, 10, 60, 468, 4263, 44727, 525780, 6830481, 96839125, 1484711160, 24430435406, 428792862307, 7986273135870, 157151111302530, 3254838706878084, 70722431837010468, 1607504293142601861, 38125031159774883774, 941342645386473873648, 24148088913729608830269

Offset

1,2

Links

Table of n, a(n) for n=1..21.

Mathematica

motzkin[n_]:=Hypergeometric2F1[(1-n)/2, -n/2, 2, 4]; Table[BellB[n] motzkin[n - 1], {n, 50}] (* Indranil Ghosh, Aug 04 2017 *)

Crossrefs

Cf. A000110, A001006, A290444, A290445.

Sequence in context: A260657 A079856 A073329 * A350225 A277472 A052600

Adjacent sequences: A290443 A290444 A290445 * A290447 A290448 A290449

Keyword

nonn

Author

N. J. A. Sloane, Aug 04 2017

Status

approved