2097018

Appears in sequences

• Fibonomial Catalan numbers.at n=6A003150
• Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.at n=21A027375
• Row sums of triangle T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd(a(1), a(2), ..., a(m), n) = 1, in A020921.at n=20A038199
• Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to complement.at n=21A045663
• Number of primitive (aperiodic) words of length n which contain exactly two different symbols.at n=20A056267
• Number of 5-tuples (v1,v2,v3,v4,v5) of nonnegative integers less than n such that v1 <= v5, v2 <= v5, v2 <= v4 and v3 <= v4.at n=26A085461
• Number of similarity classes of vectors with minimal Ducci period n.at n=20A269795
• Table read by antidiagonals where A(n,k) is the number of n X k aperiodic binary arrays.at n=38A323860
• Table read by antidiagonals where A(n,k) is the number of n X k aperiodic binary arrays.at n=42A323860
• Table read by antidiagonals where A(n,k) is the number of n X k binary arrays in which both the sequence of rows and the sequence of columns are (independently) aperiodic.at n=38A323862
• Table read by antidiagonals where A(n,k) is the number of n X k binary arrays in which both the sequence of rows and the sequence of columns are (independently) aperiodic.at n=42A323862