# A029872 (b-file synthesized from sequence entry) 0 16 1 72 2 288 3 1200 4 5376 5 25480 6 125504 7 634608 8 3269680 9 17086168 10 90282240 11 481347152 12 2585485504 13 13974825960 14 75941188736 15 414593263952 16 2272626444528 17 12502223573304 18 68996534259040 19 381858968527680 20 2118806030647328 21 11783826597027256 22 65674579024955904