20918

Appears in sequences

• Numbers whose base-12 representation has exactly 5 runs.at n=24A043654
• a(n) is twice the smallest k such that A051686(k) = prime(n).at n=34A051692
• a(n)=(2^(2^n) + 3^(2^n) + 5^(2^n))/19.at n=2A132396
• Number of nondecreasing arrangements of 10 numbers in 0..n with the last equal to n and each after the second equal to the sum of one or two of the preceding four.at n=41A189333
• Number of unlabeled balanced semi-binary rooted trees with n nodes.at n=31A320270
• a(0) = 1; thereafter a(n) = 2*(6*n^2 - 3*n + 1).at n=42A386477