226592

Appears in sequences

• Number of sequences (a_1, a_2, ..., a_n) of length n with a_1 = 1 satisfying a_i <= a_{i+1} <= 2*a_i.at n=7A016121
• Minimal (positive) solution a(n) of Pell equation b(n)^2 - D(n)*a(n)^2 = +4 with D(n)= A077425(n). The companion sequence is a(n)=A077428(n).at n=23A078355
• Rectangular table where column k equals row sums of matrix power A097712^k, read by antidiagonals.at n=37A125860
• Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 7 ones in any row.at n=6A162041
• Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 8 ones in any row.at n=6A162042
• Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 9 ones in any row.at n=6A162043