# A024296 (b-file synthesized from sequence entry) 0 0 1 1 2 0 3 11 4 140 5 2701 6 257730 7 5851691 8 1344070520 9 73317675481 10 17125877112510 11 2314602290490071 12 496897093852087700 13 132852776453477111461 14 31592203753748083380090 15 12724021149804296273555651 16 3989248533415441473207453680 17 1975896027212299978047797438641