261630

Appears in sequences

• Number of Barlow packings with group P6(bar)m2 that repeat after 2n layers.at n=19A011949
• a(n) = 4^n-2^n-2.at n=8A170940
• a(1)=1. For n>1, a(n) equals the smallest number > a(n-1) of the form a(k) U j U a(k) U j, where U represents concatenation (written in decimal) of the binary representation of the arguments, where 1<=k < n, and j = {0} or {1} or {}.at n=22A175336
• Number of similarity classes of vectors with minimal Ducci period n.at n=19A269795
• Triangle read by rows, coefficients of the polynomials P(m, n) = Sum_{k=1..n} binomial(m*n, m*k)* P(m, n-k)*z with P(m, 0) = 1 and m = 4.at n=17A278074
• Half of the height of the right trapezoidal gnomon (of the derivative of Y=X^5).at n=17A281999
• First term of n-th difference sequence of (floor(k*r)), r = sqrt(5), k >= 0.at n=20A325668
• Number of 3-regular bipartitions of n.at n=34A328547
• Expansion of (1/x) * Series_Reversion( x*(1+x-x^4)/(1+x)^4 ).at n=8A366100