67108816

Appears in sequences

• If an array is made of columns of -nacci sequences, fibo-, tribo- etc. all starting w. 1,1,2 etc, the NW to SE diagonals can be extended by computation. The above is diagonal 7. See A159741 for details.at n=20A159743
• Number of integer compositions of n whose parts are not in arithmetic progression.at n=27A389741