A099556 Row sums of triangle A099555, so that a(n) = Sum_{k=0..2n} (n-[k/2])^k where [k/2] is the integer floor of k/2.

1, 2, 5, 18, 91, 604, 5123, 53808, 679389, 10107934, 174544505, 3451802006, 77302457077, 1942469215378, 54339334896457, 1680597905918398, 57116435365152501, 2121725699286935222, 85740960693607190593

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Prog

(PARI) a(n)=sum(k=0, 2*n, (n-k/2)^k)

Crossrefs

Cf. A099555.

Sequence in context: A113715 A227094 A173227 * A057864 A320154 A032273

Adjacent sequences: A099553 A099554 A099555 * A099557 A099558 A099559

Keyword

nonn

Author

Paul D. Hanna, Oct 22 2004

Status

approved