20817

Appears in sequences

• A simple grammar.at n=11A052814
• List of codewords in binary lexicode with Hamming distance 6 written as decimal numbers.at n=34A075934
• The arithmetic mean of the n-th and (n+1)-st cubes, rounded down.at n=27A147656
• Expansion of (1-x-sqrt(1-6x-3x^2))/(2x).at n=7A156016
• Euler transform of period 5 sequence [ 2, 1, 1, 2, 1, ...].at n=25A205183
• Number of partitions p of n such that (number of numbers in p of form 3k+1) < (number of numbers in p of form 3k+2).at n=44A241737
• Number of integer partitions of n whose parts plus 1 are relatively prime.at n=36A318980
• Sum_{n>=0} a(n) * x^n / (n!)^2 = exp(BesselI(0,2*sqrt(x))^3 - 1).at n=4A336636
• Composite numbers for which A324644(n)/A324198(n) = 2 and sigma(n) == 2 (mod 4).at n=18A371082