A026330 - cp's OEIS frontend

A026330 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(2n) = n+1. Also a(n) = T(2n,n+1), where T is the array in A026323.

%I A026330 #6 May 28 2021 13:50:26
%S A026330 0,3,16,90,504,2849,16224,92988,535840,3101769,18023856,105076972,
%T A026330 614318040,3600356175,21146233920,124436295054,733493553408,
%U A026330 4330155834122,25597817572320,151508857016244,897759260100648,5325078489063039
%N A026330 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(2n) = n+1. Also a(n) = T(2n,n+1), where T is the array in A026323.
%Y A026330 Cf. A026323.
%K A026330 nonn
%O A026330 0,2
%A A026330 _Clark Kimberling_

cp's OEIS Frontend

A026330 a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(2n) = n+1. Also a(n) = T(2n,n+1), where T is the array in A026323.