18686

Appears in sequences

• Numbers k such that 6!*(2*k-7)!/(k!*(k-1)!) is an integer.at n=19A004786
• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=22A004787
• a(n) = dot product of row n in Catalan triangle A033184 with row n in Pascal's triangle.at n=7A116363
• Binomial transform of the "1,2,3,..." triangle.at n=56A125027
• 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, -1, 0), (-1, 0, 1), (-1, 1, -1), (0, 0, -1), (1, 0, 0)}.at n=11A148124
• Binomial sums: a(n) = Sum_{k=0..floor(n/3)} binomial(n-k,2*k)^2.at n=11A191349
• Numbers n such that 4n+3 is a palindromic prime.at n=42A193419
• Central coefficients of triangle A096815.at n=11A212421
• Numbers k with property that for every base b >= 2, there is a number m such that m+s(m) = k, where s(m) = sum of digits in the base-b expansion of m.at n=45A230624
• a(n) = Sum_{k=0..2*n/3} C(n-k,2*k-n)^2.at n=22A298567