22566

Appears in sequences

• Number of certain self-avoiding walks with n steps on square lattice (see reference for precise definition).at n=16A002976
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (1, p(1), p(2), ...), t = (composite numbers).at n=39A024480
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (1, p(1), p(2), ...), t = (composite numbers).at n=38A025100
• Triangle read by rows: T(n,k) is the number of labeled commutative monoids of order n with k idempotents and a fixed identity.at n=27A058160
• Number of labeled lattices with a fixed bottom.at n=6A058164
• Triangle read by rows: T(n,k) is the number of labeled commutative semigroups of order n with k idempotents.at n=20A058167
• Number of collections of nonempty multisets with a total of n objects of exactly two colors.at n=12A255942
• Sum of the asymmetry degrees of all compositions of n without 2's.at n=18A275443
• Number of prefix-closed polyominoes of area n.at n=9A275943
• Expansion of e.g.f. Product_{k>=1} (1 + (exp(x)-1)^(k^2)) / (1 - (exp(x)-1)^(k^2)).at n=6A306147