1049760

Appears in sequences

• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*12^j.at n=17A038302
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*9^j.at n=18A038335
• a(n) = Sum_{d|n} phi(d)*2^(n/d).at n=20A053635
• Ninth column of triangle A067410.at n=5A067416
• Expansion of e.g.f. (1+3*x)/(1-3*x).at n=6A098559
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even determinant.at n=35A210369
• a(n) = Sum_{d|n} (2^d + 2*(-1)^d)*phi(n/d).at n=19A306896
• a(0) = 1; for n > 0, a(n) = A000120(n) * a(n-A000120(n)), where A000120(n) is the binary weight of n.at n=44A320008
• Irregular triangle read by rows: T(n,k) = [x^k]p_n(x), where (p_n(x)/x^(3n)) * exp(-1/x^2) is the n-th derivative of exp(-1/x^2), n >= 1, 0 <= k <= 2*n-2.at n=48A344031