24486

Appears in sequences

• Number of primitive (period n) periodic palindromic structures using a maximum of two different symbols.at n=30A056513
• Number of primitive (period n) periodic palindromic structures using exactly two different symbols.at n=29A056518
• a(n) = prime(n)^2 - prime(n+1).at n=36A062235
• Enneagonal numbers whose sum of digits is also enneagonal.at n=11A117051
• a(0)=1; thereafter a(n)=a(n-1)+a([n/Phi]), where Phi=(1+sqrt(5))/2, the golden ratio.at n=45A131882
• Triangle, read by rows, equal to P^6, where triangle P = A135880; also equals Q^3 where Q = P^2 = A135885.at n=41A135893
• 9-gonal numbers (A001106) that are the sum of two consecutive 9-gonal numbers.at n=0A258441
• G.f.: 1 / Product_{n>=0} (1 - x^(n+6))^((n+1)*(n+2)*(n+3)*(n+4)*(n+5)/5!).at n=19A264926
• Number of n X 3 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.at n=14A266007
• Number of regions into which a figure made up of a row of n adjacent congruent rectangles is divided upon drawing diagonals of all possible rectangles (a(0)=0 by convention).at n=19A306302
• a(n) is the length of the n-th row of A348575.at n=9A349547
• 9-gonal numbers which are products of five distinct primes.at n=0A356355
• E.g.f. satisfies log(A(x)) = (exp(x) - 1)^3 * A(x).at n=7A357010
• a(n) = (n - 1) * Sum_{k=2..n} A000010(k).at n=42A385682