24807

Appears in sequences

• a(1) = 1, a(n) = 2*a(n-1) + a([n/2]).at n=13A033489
• Number of independent sets of nodes in graph C_4 X P_n (n>2).at n=6A051926
• a(n) = p^2 + p + 1 where p runs through the primes.at n=36A060800
• Numbers whose square is a zeroless pandigital number (i.e., use the digits 1 through 9 once).at n=19A071519
• a(n) = C(n-2,2)+C(n-5,5)+...+C(n-(3*floor((n-3)/3)+2),3*floor((n-3)/3)+2).at n=24A101551
• Numbers n such that n contains exactly 5 digits, all distinct, and n^2 contains exactly 9 distinct digits.at n=20A204691
• Numbers arising in computing the Turan function of cycles of length 4.at n=40A217004
• Length of period of Narayana sequence A000930 modulo n-th prime.at n=36A271901
• Array read by antidiagonals: T(m,n) is the number of independent sets in the stacked prism graph C_m X P_n.at n=39A286513
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S^3.at n=24A291217
• Numbers whose square contains all of the digits 1 through 9.at n=19A294661
• Number of endofunctions on [n] whose cycle lengths are triangular numbers.at n=6A305824
• a(n) is the minimum positive integer k such that the concatenation of k, a(n-1), a(n-2), ..., a(2), and a(1) is the lesser of a pair of twin primes (i.e., a term of A001359), with a(1) = 11.at n=35A350246
• Expansion of g.f. (1 - sqrt(1 - 2*x + 2*x*sqrt(1 - 4*x)))/(2*x).at n=11A369528
• Expansion of (1 + x)/(1 - x^3*(1 + x)^3).at n=23A375319
• Number of integer compositions of n that are the first sums of more than one composition.at n=35A391628