0,2

For a(n) in terms of U(n+1) and U(n) with U(n) := A002605(n) see A073387 and the row polynomials of triangles A073405 and A073406.

a(n)=sum(b(k)*c(n-k), k=0..n) with b(k) := A002605(k) and c(k) := A073394(k).

a(n)=(2^n)*sum(binomial(n-k+8, 8)*binomial(n-k, k)*(1/2)^k, k=0..floor(n/2)).

G.f.: 1/(1-2*x*(1+x))^9.

Ninth (m=8) column of triangle A073387.

Sequence in context: A042940 A034727 A060532 this_sequence A020920 A083812 A086573

Adjacent sequences: A073394 A073395 A073396 this_sequence A073398 A073399 A073400

nonn,easy

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Aug 2, 2002