# A099603 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 12 4 20 5 64 6 104 7 336 8 544 9 1760 10 2848 11 9216 12 14912 13 48256 14 78080 15 252672 16 408832 17 1323008 18 2140672 19 6927360 20 11208704 21 36272128 22 58689536 23 189923328 24 307302400 25 994451456 26 1609056256 27 5207015424 28 8425127936 29 27264286720