# A007860 (b-file synthesized from sequence entry) 1 1 2 1 3 4 4 12 5 44 6 175 7 718 8 3052 9 13308 10 59139 11 266974 12 1220879 13 5643562 14 26327769 15 123793450 16 586078393 17 2791408028 18 13365916545 19 64302770488 20 310672722803 21 1506737267266 22 7332920012492 23 35800278685252 24 175286440178448 25 860517328379634 26 4234766396436095