# A049322 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 0 4 0 5 0 6 2 7 4 8 8 9 12 10 20 11 28 12 40 13 52 14 70 15 88 16 112 17 136 18 168 19 200 20 240 21 280