# A012348 (b-file synthesized from sequence entry) 0 0 1 2 2 8 3 368 4 18048 5 2068992 6 306585600 7 69776517120 8 20465184768000 9 7935055273328640 10 3823692307188940800 11 2274500815301011046400 12 1624840840672099644211200 13 1378125905023775157056962560