63180

Appears in sequences

• a(n) is the number of Dyck paths of semilength n+6 having its first peak at height n+1.at n=17A005557
• Specific heat coefficients for square lattice spin 3/2 Ising model.at n=24A010113
• Number of nonnegative integers with property that their base 9/7 expansion (see A024655) has n digits.at n=37A245429
• Numbers n = concat(s,t) such that n = sigma(s*t), where sigma(x) is the sum of the divisors of x.at n=5A260097
• Number of North-East lattice paths from (0,0) to (n,n) that cross the diagonal y = x horizontally exactly four times.at n=5A268447
• Sheffer triangle (exp(x), exp(3*x) - 1). Named S2[3,1].at n=25A282629
• Number of nX3 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=11A301959
• a(n) = 378*n^2 - 54*n (n>=1).at n=12A305070
• Numbers k such that s(k) = s(k+1), where s(k) is the unitary analog of the alternating sum-of-divisors function (A307037).at n=21A333408