**a(n) = Sum{(k+1)*T(n,m-k)}, 0<=k<=m, where m=0 for n=0,1; m=n for n >= 2; T given by A026120.**

*1, 3, 12, 36, 108, 324, 972, 2916, 8748, 26244, 78732, 236196, 708588, 2125764*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

Links to OEIS content are included according to The OEIS End-User License Agreement .