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A084536
Triangular array related to Motzkin triangle A026300.
2
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
0,3
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.
FORMULA
T(n,n) = A002212(n+1). - Philippe Deléham, Mar 23 2007
EXAMPLE
Triangle begins
1;
1, 3;
1, 6, 10;
1, 9, 29, 36;
1, 12, 57, 132, 137; ...
CROSSREFS
Sequence in context: A163213 A095066 A169955 * A110770 A106855 A064282
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jun 29 2003
EXTENSIONS
More terms from Philippe Deléham, Mar 23 2007
STATUS
approved