30273

Appears in sequences

• a(n) is the sum of the first n factorials in decreasing powers from n to 1. a(n) = Sum_{k = 1..n} k!^(n-k+1).at n=5A121945
• Centered 32-gonal numbers.at n=43A195315
• Number of cubic plane graphs with 2n nodes, minimal face size 3 and maximal face size 6.at n=31A219747
• Fundamental discriminants d uniquely characterizing all complex biquadratic fields Q(sqrt(-3),sqrt(d)) which have 3-class group of type (3,3) and second 3-class group isomorphic to SmallGroup(729,37).at n=16A250240
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 8 king-move adjacent elements, with upper left element zero.at n=12A305240
• Numbers obtained by reinterpreting base-2 representation of odd numbers in primorial base.at n=45A328462
• Numbers k such that (A276086(k)/s)^s >= k^(s-1) and A276086(k) <= A003415(k), where A003415 is the arithmetic derivative, A276086 is the primorial base exp-function, and s = bigomega(k).at n=43A370128
• a(n) is the index where n appears for first time in the list of first differences of the numbers with middle divisors.at n=21A390114