A104766 Triangle T(n,k) = A001629(n-k+2) read by rows, 1<=k<=n.

1, 2, 1, 5, 2, 1, 10, 5, 2, 1, 20, 10, 5, 2, 1, 38, 20, 10, 5, 2, 1, 71, 38, 20, 10, 5, 2, 1, 130, 71, 38, 20, 10, 5, 2, 1

Offset

1,2

Comments

The triangle is the matrix square of the triangle A104762: T(n,k) = sum_{j= k..n} A104762(n,j)*A104762(j,k).

Links

Table of n, a(n) for n=1..36.

Example

First few rows of the triangle:
1;
2, 1;
5, 2, 1;
10, 5, 2, 1;
20, 10, 5, 2, 1;
38, 20, 10, 5, 2, 1;
71, 38, 20, 10, 5, 2, 1;
...

Crossrefs

Cf. A001629, A104762, A104763, A006478 (row sums).

Sequence in context: A207607 A146024 A146023 * A361681 A105084 A375100

Adjacent sequences: A104763 A104764 A104765 * A104767 A104768 A104769

Keyword

nonn,tabl

Author

Gary W. Adamson, Mar 24 2005

Status

approved