A188023 Triangle read by rows, T(n,k) = k*A115361(n-1,k-1).

1, 1, 2, 0, 0, 3, 1, 2, 0, 4, 0, 0, 0, 0, 5, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 0, 7, 1, 2, 0, 4, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 5, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12

Offset

1,3

Comments

Triangle obtained by multiplying the lower triangular matrices A115361 and A127648.

Links

Table of n, a(n) for n=1..78.

Example

First few rows of the triangle =
1
1, 2
0, 0, 3
1, 2, 0, 4
0, 0, 0, 0, 5
0, 0, 3, 0, 0, 6
0, 0, 0, 0, 0, 0, 7
1, 2, 0, 4, 0, 0, 0, 8
0, 0, 0, 0, 0, 0, 0, 0, 9
0, 0, 0, 0, 5, 0, 0, 0, 0, 10
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11
0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12
...

Crossrefs

Cf. A115361, A127648, A129527 (row sums)

Sequence in context: A082660 A134673 A131636 * A077888 A319668 A167634

Adjacent sequences: A188020 A188021 A188022 * A188024 A188025 A188026

Keyword

tabl,nonn

Author

Gary W. Adamson, Mar 19 2011

Status

approved