# A259612 (b-file synthesized from sequence entry) 1 1 2 1 3 6 4 58 5 720 6 10506 7 172284 8 3092717 9 59758608 10 1228626514 11 26657057728 12 606616602302 13 14410894287172 14 356081682054300 15 9124705519233832 16 241916247567814448 17 6622686675121529288 18 186900262172114801748 19 5429779249015331564288 20 162190080378495122207760