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

1,2

Links

Table of n, a(n) for n=1..105.

Formula

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

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

Example

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.

Sequence in context: A205451 A227899 A208244 * A160696 A152545 A359538

Adjacent sequences: A272168 A272169 A272170 * A272172 A272173 A272174

Keyword

nonn,tabl

Author

Omar E. Pol, Apr 21 2016

Status

approved