A084536 Triangular array related to Motzkin triangle A026300.

1, 1, 3, 1, 6, 10, 1, 9, 29, 36, 1, 12, 57, 132, 137, 1, 15, 94, 315, 590, 543, 1, 18, 140, 612, 1629, 2628, 2219, 1, 21, 195, 1050, 3605, 8127, 11732, 9285, 1, 24, 259, 1656, 6950, 19992, 39718, 52608, 39587, 1, 27, 332, 2457, 12177, 42498, 106644, 191754

Offset: 0

Author

N. J. A. Sloane, Jun 29 2003

Keywords

• nonn
• tabl

Comments

Reversal of A091965. Row sums give A026378. - Philippe Deléham, Mar 23 2007

Examples

			Triangle begins
  1;
  1,   3;
  1,   6,  10;
  1,   9,  29,  36;
  1,  12,  57, 132, 137; ...
		

References

• A. Nkwanta, Lattice paths and RNA secondary structures, in African Americans in Mathematics, ed. N. Dean, Amer. Math. Soc., 1997, pp. 137-147.

Formula

T(n,n) = A002212(n+1). - Philippe Deléham, Mar 23 2007

Extensions

More terms from Philippe Deléham, Mar 23 2007