A272172 Triangle read by rows: T(n,k) in which row n lists the first n terms of A000203 in reverse order.

1, 3, 1, 4, 3, 1, 7, 4, 3, 1, 6, 7, 4, 3, 1, 12, 6, 7, 4, 3, 1, 8, 12, 6, 7, 4, 3, 1, 15, 8, 12, 6, 7, 4, 3, 1, 13, 15, 8, 12, 6, 7, 4, 3, 1, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1, 12, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1, 28, 12, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1, 14, 28, 12, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1, 24, 14, 28

Offset: 1

Author

Omar E. Pol, Apr 21 2016

Keywords

• nonn
• tabl

Examples

			Triangle begins:
1;
3,   1;
4,   3,  1;
7,   4,  3,  1;
6,   7,  4,  3,  1;
12,  6,  7,  4,  3,  1;
8,  12,  6,  7,  4,  3,  1;
15,  8, 12,  6,  7,  4,  3,  1;
13, 15,  8, 12,  6,  7,  4,  3,  1;
18, 13, 15,  8, 12,  6,  7,  4,  3,  1;
12, 18, 13, 15,  8, 12,  6,  7,  4,  3,  1;
28, 12, 18, 13, 15,  8, 12,  6,  7,  4,  3,  1;
...
		

Crossrefs

Mirror of A245093.

Column k gives A000203 starting in row k.

Row sums give A024916.

Cf. A004736, A104887, A272171.

Formula

a(n) = A000203(A004736(n)).

T(n,k) = A000203(n-k+1).