# A090580 (b-file synthesized from sequence entry) 1 1 2 5 3 15 4 35 5 70 6 126 7 210 8 330 9 495 10 714 11 992 12 1330 13 1725 14 2170 15 2654 16 3162 17 3675 18 4170 19 4620 20 4998 21 5283 22 5460 23 5520 24 5460 25 5283 26 4998 27 4620 28 4170 29 3675 30 3162 31 2654 32 2170 33 1725 34 1330 35 992 36 714 37 495 38 330 39 210 40 126 41 70 42 35 43 15 44 5 45 1