285390

Appears in sequences

• Number of unlabeled 7-ary cacti having n polygons.at n=7A054369
• Numbers k such that 2^k == -1 (mod k-1).at n=12A055685
• Numbers k such that 8^k == -1 (mod k-1).at n=27A055691
• a(n) = n^4 - (n-1)^4 + (n-2)^4 - ... 0^4.at n=27A062392
• Doubly hexagonal numbers.at n=14A063249
• Numbers n such that n and its 10's complement are both triangular numbers; that is, n and 10^k - n (where k is the number of digits in n) are triangular numbers.at n=10A068812
• Triangle, read by rows, T(n, k) = binomial(n*binomial(n, floor((n-k)/2)), k).at n=47A157109
• Half the number of length n integer sequences with sum zero and sum of squares 8.at n=13A157534
• Numbers n such that n-1 is a divisor of 3^n + 5^n.at n=20A234535
• Semiperimeter of the unique primitive Pythagorean triple whose inradius is A000045(n) and such that its long leg and its hypotenuse are consecutive natural numbers.at n=14A382609