80863

Properties

Appears in sequences

• Number of binary rooted trees with n nodes and height exactly 7.at n=21A036596
• Primes p such that q-p = 34, where q is the next prime after p.at n=25A134116
• Primes of the form 14 n^2-1.at n=20A143832
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.at n=13A147447
• a(n) = 56*n^2 - 1.at n=37A158658
• Number of ways to arrange 2 nonattacking knights on the lower triangle of an n X n board.at n=27A194486
• Number of equivalence classes of Dyck paths of semilength n for the consecutive pattern UDUDD, where U=(1,1) and D=(1,-1).at n=22A317639
• Expansion of e.g.f. -exp(x * sqrt(1-2*x)).at n=8A362163
• Prime numbersat n=7915