Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 10 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 1, s(2n) = 7.

A094825

Number of (s(0), s(1), ..., s(2n)) such that 0 < s(i) < 10 and |s(i) - s(i-1)| = 1 for i = 1,2,...,2n, s(0) = 1, s(2n) = 7.

Terms

    a(0) =1a(1) =7a(2) =35a(3) =153a(4) =624a(5) =2444a(6) =9333a(7) =35055a(8) =130207a(9) =479941a(10) =1759616a(11) =6427032a(12) =23412105a(13) =85121783a(14) =309062619a(15) =1121050449a(16) =4063463728a(17) =14721293860a(18) =53313308477a(19) =193023319071a(20) =698715633111

External references