21273

Appears in sequences

• Expansion of 1/(1-x^3-x^4-x^5-x^6-x^7-x^8).at n=32A017821
• Expansion of 1/((1-2x)(1-4x)(1-6x)(1-7x)).at n=4A025965
• a(n) = floor(X/Y) where X = concatenation in decreasing order of (2n)-th even number to (n+1)-th even number and Y = that of first n even numbers in increasing order.at n=12A067092
• a(0) = a(1) = 1. a(n) = a(n-1) + a(n - b(n)), where b(n) is largest prime dividing n.at n=36A137809
• Number of ways to arrange 5 nonattacking triangular rooks on an n X n X n triangular grid.at n=9A193983
• Number of (n+2)X(5+2) 0..3 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=19A253022
• Number of integer partitions of n whose multiplicities have integer median.at n=37A360687