# A137400 (b-file synthesized from sequence entry) 0 6 1 30 2 140 3 631 4 2786 5 12136 6 52368 7 224406 8 956516 9 4060038 10 17175132 11 72454075 12 304941386 13 1280898304 14 5371301504 15 22491017758 16 94055344244 17 392888085100 18 1639534704632 19 6835739258998 20 28477594607348 21 118551827347576