# A015801 (b-file synthesized from sequence entry) 1 6 2 12 3 30 4 68 5 96 6 264 7 368 8 2064 9 4240 10 4636 11 6588 12 7276 13 10272 14 11800 15 36600 16 188544 17 251648 18 415000 19 1296640 20 3113472 21 50202624 22 201068544 23 16097947360 24 17177182208 25 25876667904 26 85895741440