273840

Appears in sequences

• Starting position (after the decimal point) of the first n-digit palindrome in the decimal expansion of Pi.at n=11A280631
• Number of n X 2 0..1 arrays with every element equal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.at n=10A297945
• Square array A(n,k) = A388978(A388981(n, k)), read by descending antidiagonals.at n=13A389168