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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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

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

REFERENCES

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

LINKS

Table of n, a(n) for n=0..52.

FORMULA

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

EXAMPLE