37758

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/20).at n=31A011930
• Row 6 of square array defined in A047662.at n=8A047663
• Starting positions of strings of three 4's in the decimal expansion of Pi.at n=27A083615
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=41A125775
• Numbers k such that k^2 divides 5^k-1.at n=32A127105
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 0), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.at n=8A150559
• Number of standard Young tableaux of shape [3n,3].at n=20A215543
• G.f.: exp( Sum_{n>=1} x^n/n * Product_{k>=1} (1 + x^(n*k)*(1 + x^k)^n) ).at n=20A218576
• Number of ways to stack n triangles symmetrically (pointing upwards or downwards depending on row parity).at n=35A316585
• Number of set partitions of [n] where all prime-indexed blocks are not singletons.at n=10A332248
• Products of 5 distinct primes that are sandwiched between squarefree semiprime numbers.at n=39A376949