39889

Appears in sequences

• Apocalypse primes: 10^665+a(n) has 666 decimal digits and is prime.at n=27A115983
• Number of triangle-free graphs g on n nodes for which the chromatic number chi(g) equals r(g) = ceiling((Delta(g) + 1 + omega(g))/2).at n=13A119414
• A (4,-3) Somos-4 sequence.at n=6A184121
• Regular triangle where T(n,k) is the number of non-isomorphic multiset partitions of k-element multiset partitions of multisets of size n.at n=53A330473
• a(n) = a(n-1) - a(n-2) + a(n-3) + a(n-4), with a(1) = a(2) = a(3) = a(4) = 1.at n=43A343885