66677

Appears in sequences

• Number of strict opposition perfect graphs on n nodes.at n=8A123459
• Number of n X n symmetric binary matrices containing no more than two 1s in any 2 X 2 sub-block.at n=6A139007
• Number of n X n binary matrices, symmetric about the diagonal and under 90-degree rotation, with no more than 2 ones in any 2 X 2 subblock.at n=11A141506
• Numbers n such that 3^6*2^n - 1 is prime.at n=24A230527
• Numbers which have only digits 6 and 7 in base 10.at n=33A256292