# A003495 (b-file synthesized from sequence entry) 0 1 1 12 2 132 3 1392 4 14292 5 144000 6 1430592 7 14057280 8 136914804 9 1323843936 10 12722294736 11 121625850240 12 1157512059936 13 10972654675200 14 103654156958208 15 976153872234240 16 9167420099612340