104380

Appears in sequences

• Number of binary sequences of length n containing exactly one subsequence 0000.at n=19A118898
• Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.at n=12A260835
• a(n) = 1*2*3 + 4*5*6 + 7*8*9 + 10*11*12 + 13*14*15 + 16*17*18 + ... + (up to n).at n=33A319014