19238

Appears in sequences

• Triangle a(n,m)=number of m-element antichains on a labeled n-set; number of monotone n-variable Boolean functions with m mincuts (lower units), m=0..binomial(n,floor(n,2)).at n=44A059119
• When expressed in base 3 and then interpreted in base 4, is a multiple of the original number.at n=16A062853
• Expansion of (eta(q)^3*eta(q^10)^6)/(eta(q^2)^2*eta(q^5)^7) in powers of q.at n=47A113977
• Numbers k such that (25*10^k + 161)/3 is prime.at n=22A281110
• Number of self-avoiding planar walks of length n+1 starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) with the restriction that (0,1) is never used below the diagonal and (1,0) is never used above the diagonal.at n=12A284778
• Growth of the Lamplighter group: number of elements in the Lamplighter group L_2 = Z/2Z wr Z of length up to n with respect to the standard generating set {a,t}.at n=15A294683
• Numbers n such that there are precisely 2 groups of order n and 3 of order n + 1.at n=17A296025
• a(n) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite.at n=13A330128
• Triangle read by rows: Related to the Euler numbers.at n=19A371994
• Expansion of 1/sqrt(1 - 4*x^3/(1 - x)^2).at n=15A376809
• Number of digits in 3^(n!).at n=8A385950
• a(n) = 3*binomial(2*n+1,n+1) - n^2 - 2*n - 4.at n=6A387922