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

1,2

Links

Table of n, a(n) for n=1..94.

Formula

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

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

Example

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.

Sequence in context: A030758 A347065 A322103 * A104764 A152842 A307280

Adjacent sequences: A272169 A272170 A272171 * A272173 A272174 A272175

Keyword

nonn,tabl

Author

Omar E. Pol, Apr 21 2016

Status

approved