23618

Appears in sequences

• a(0) = 1; for n > 0, a(n) = 41*n^2 + 2.at n=24A206399
• Number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=19A207143
• Number of (n+1) X 5 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=17A207145
• Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.at n=15A207147
• Number of n-bead necklaces labeled with numbers -2..2 not allowing reversal, with sum zero and first and second differences in -2..2.at n=13A209001
• Numbers k such that 373*2^k+1 is prime.at n=14A323027
• Records in A210693.at n=11A391870