# A127261 (b-file synthesized from sequence entry) 0 2 1 2 2 24 3 68 4 376 5 1432 6 6624 7 27568 8 121376 9 518432 10 2250624 11 9685568 12 41877376 13 180610432 14 779994624 15 3366093568 16 14532133376 17 62725202432 18 270771738624 19 1168795501568 20 5045308389376