102315

Appears in sequences

• Number of ways to partition n labeled elements into 4 pie slices allowing the pie to be turned over; number of 2-element proper antichains of an n-element set.at n=9A032263
• Triangle read by rows in which row n gives number of ways to partition n labeled elements into k pie slices allowing the pie to be turned over (n >= 1, 1 <= k <= n).at n=48A133800
• Numbers k such that (167*10^k - 17)/3 is prime.at n=20A293863
• Triangle read by rows, T(n, k) = Pochhammer(3, k)*Stirling2(3 + n, 3 + k) for n >= 0 and 0 <= k <= n.at n=29A294032
• Number of double palindrome structures of length n using exactly two different symbols.at n=24A328688