33241

Appears in sequences

• a(1)=1, a(n) = n*20^(n-1) + a(n-1).at n=3A014937
• Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907.at n=14A026918
• a(n) = 1 + 2*n + 3*n^2 + 4*n^3.at n=20A056578
• Number of base 31 n-digit numbers with adjacent digits differing by five or less.at n=4A126552
• Partial sums of A024770.at n=35A173057
• Number of inequivalent (mod D_4) ways to place 2 nonattacking knights on an n X n board.at n=25A243717
• Total number of congruence subgroups of PSL(2,Z) of genus n.at n=13A258691
• Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.at n=8A260278