113160

Appears in sequences

• Triangle: self-converse semigroups of order n with k idempotents.at n=42A058118
• Values of n such that n^a-+a are primes, a=7.at n=32A155022
• Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, up, up, up.at n=4A177588
• Number of n X 2 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=19A279262
• Expansion of Product_{k>=1} ((1 + x^(4*k)) / (1 - x^k)).at n=42A285472
• 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=15A289329
• Averages k of twin prime pairs such that A075255(k) is also the average of a twin prime pair.at n=17A340570