19440

Appears in sequences

• Triangle of coefficients in expansion of (1+6x)^n.at n=25A013613
• Alkane (or paraffin) numbers l(9,n).at n=14A018210
• Cycle class sequence c(2n) (the number of true cycles of length 2n in which a certain node is included) for zeolite CLO = Cloverite starting with a T4 atom.at n=6A019000
• Number of compositions of n into 8 ordered relatively prime parts.at n=10A023033
• A convolution triangle of numbers obtained from A036068.at n=22A030524
• For all n, if d is recursively applied to a(n) exactly 6 times then the fixed point of d-iteration is just reached.at n=30A036458
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*9^j.at n=23A038215
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*4^j.at n=23A038222
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*6^j.at n=19A038224
• Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*6^j.at n=18A038224
• Triangle whose (i,j)-th entry is binomial(i,j)*4^(i-j)*3^j.at n=25A038233
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j).at n=23A038255
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*3^j.at n=17A038257
• Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*3^j.at n=16A038257
• Triangle whose (i,j)-th entry is binomial(i,j)*9^(i-j)*2^j.at n=25A038292
• Expansion of e.g.f.: (1-x)/(1-3*x).at n=5A052563
• Expansion of e.g.f. x^3/(1-3*x).at n=6A052678
• Numbers k such that Sum_{j} p_j = Sum_{j} e_j where Product_{j} p_j^(e_j) is the prime factorization of k.at n=23A054411
• Number of square divisors of n!.at n=36A055993
• Number of square divisors of n!.at n=35A055993