A272171 Triangle read by rows: T(n,k) in which row n lists the first n terms of A000005 in reverse order.

1, 2, 1, 2, 2, 1, 3, 2, 2, 1, 2, 3, 2, 2, 1, 4, 2, 3, 2, 2, 1, 2, 4, 2, 3, 2, 2, 1, 4, 2, 4, 2, 3, 2, 2, 1, 3, 4, 2, 4, 2, 3, 2, 2, 1, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1, 6, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1, 2, 6, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1, 4, 2, 6, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1

Offset: 1

Author

Omar E. Pol, Apr 21 2016

Keywords

• nonn
• tabl

Examples

			Triangle begins:
1;
2, 1;
2, 2, 1;
3, 2, 2, 1;
2, 3, 2, 2, 1;
4, 2, 3, 2, 2, 1;
2, 4, 2, 3, 2, 2, 1;
4, 2, 4, 2, 3, 2, 2, 1;
3, 4, 2, 4, 2, 3, 2, 2, 1;
4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
6, 2, 4, 3, 4, 2, 4, 2, 3, 2, 2, 1;
...
		

Crossrefs

Column k gives A000005 starting in row k.

Row sums give A006218, n >= 1.

Cf. A004736, A104887, A272172.

Formula

a(n) = A000005(A004736(n)).

T(n,k) = A000005(n-k+1).