21932

Appears in sequences

• Coordination sequence for octagonal tiling is a(n) + A103908(n)*sqrt(2).at n=39A103909
• Number of nonnegative solutions to x^2 + y^2 + z^2 < n^2.at n=34A218711
• a(n) = Fibonacci(p) mod p^2, where p = prime(n).at n=52A236395
• Expansion of b(2)*b(6)/(1 - 2*x + x^3 - x^4 - x^5 + 2*x^6), where b(k) = (1-x^k)/(1-x).at n=14A264079
• Number of binary words w of length n for which s, the longest proper suffix of w that appears at least twice in w, is of length 1 (i.e., either s = 0 or s = 1).at n=21A284122
• Number of (unlabeled) rooted trees with n leaf nodes and without unary nodes or outdegrees larger than eight.at n=12A292214
• a(0) = 1; thereafter a(n) = 2*(6*n^2 - 3*n + 1).at n=43A386477