122638

Appears in sequences

• T(2n,n), T given by A026659.at n=9A026660
• T(n,[ n/2 ]), T given by A026659.at n=18A026665
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (1, -1, -1), (1, 0, 1), (1, 1, 0)}.at n=9A150378
• G.f.: A(x) = exp( Sum_{n>=1} A183240(n)*x^n/n ) where A183240 is the sums of the squares of multinomial coefficients.at n=6A183241
• Weighted count of equivalence classes of words w of length n+3 over {a, b, c, d, A, *} having exactly n letters, exactly three *'s, an even number of lowercase a's, and weight (-1)^(A(w)), where A(w) is the number of uppercase letters A.at n=6A390530