17685969

Appears in sequences

• q-Catalan numbers (binomial version) for q=-4.at n=4A015058
• Triangle of coefficients of polynomials p_n(x) (exponents in increasing order) where 2^(x-n-1)p_n(x)/n! counts the ways a game of Nim with two piles of sizes x and n can be played out (x > 0, n >= 0).at n=40A289329