81027domain: NAppears in sequencesPositions of 5-digit terms in the continued fraction for Pi (3 is position 0).at n=7A048961Number of n X 2 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.at n=34A229422