28217

Appears in sequences

• Number of n X n symmetric binary matrices with no row sum greater than 4.at n=5A139680
• a(n) = 49*n^2 - 7.at n=23A158484
• Number of nX2 0..2 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=16A201426
• a(0)=0, a(1)=1, a(n) = min{4 a(k) + (4^(n-k)-1)/3, k=0..(n-1)} for n>=2.at n=26A259665
• Numbers k such that k!!! - 3^k is prime.at n=30A261316
• a(n) = n*(n + 1)*(n^2 + n + 22)/24.at n=28A318054
• Number of graphs with loops spanning n labeled vertices.at n=5A322661
• Array read by antidiagonals: T(n,k) is the number of n X n symmetric binary matrices with no row sum greater than k.at n=50A334548